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python is prime

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Grumpy Gemsbok answered on March 26, 2021 Popularity 9/10 Helpfulness 3/10

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from math import sqrt, floor;

def is_prime(num):
    if num < 2: return False;
    if num == 2: return True;
    if num % 2 == 0: return False;
    for i in range(3,floor(sqrt(num))+1,2):
        if num % i == 0: return False;
    return True;

Popularity 9/10 Helpfulness 3/10 Language python

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Contributed on Jun 13 2022

Grumpy Gemsbok

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is prime python

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def is_prime(n):
    for i in range(2,int(n**0.5)+1):
        if n%i==0:
            return False
    return True

Popularity 10/10 Helpfulness 10/10 Language python

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Contributed on May 04 2022

Mouad En-naciry

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is prime python

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import math
def isPrimeNumber(n):
    if (n < 2):
        return False;
    sq = int(math.sqrt(n))
    for i in range(2, sq + 1):
        if (n % i == 0):
            return False
    return True

Popularity 10/10 Helpfulness 8/10 Language python

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Contributed on Oct 29 2021

Sore Stork

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prime number in python

Comments(2)

def prime_number(n):
    c = 0
    for x in range(2, n):
        if n % x == 0:
            c = c + 1
    return c


n = int(input("Enter a number = "))
if prime_number(n) == 0:
    print("Prime number.")
else:
    print("Not prime number.")

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Contributed on May 10 2022

Excited Earthworm

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primes in python

Comments(1)

from math import sqrt
for i in range(2, int(sqrt(num)) + 1):
    if num % i == 0:
        print("Not Prime")
        break
    print("Prime")

# Note: Use this if your num is big (ex. 10000 or bigger) for efficiency
# The result is still the same if the num is smaller

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Contributed on Aug 13 2021

Old-fashioned Ostrich

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python prime number

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def is_prime(n):
	if n == 0 or n == 1 or n == 4:
		return False
	for i in range(2, int(n/2)):
		if n % i == 0:
			return False
	return True

A relatively "faster" prime check.

It gets noticably slow once it gets to 8+ digits.

Popularity 8/10 Helpfulness 7/10 Language python

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Contributed on Jan 12 2023

OwO People

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prime number in python

Comment

a=int(input('print number:'))
for i in range(2,a):
    if a%i !=0:
        continue
    else:
        print("Its not a prime number")
        break # here break is exicuted then it means else would not be exicuted.
else:
    print("Its a prime number")

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Contributed on Dec 19 2021

Impossible Impala

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python prime check

Comment

def isPrime(n):
  if n<2:		#1, 0 and all negative numbers are not prime
    return False
  elif n==2:	#2 is prime but cannot be calculated with the formula below becuase of the range function
    return True
  else:
    for i in range(2, n):
      if (n % i) == 0:	#if you can precisely divide a number by another number, it is not prime
        return False
    return True			#if the progam dont return False and arrives here, it means it has checked all the numebrs smaller than n and nono of them divides n. So n is prime

Popularity 10/10 Helpfulness 6/10 Language python

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Contributed on Mar 26 2021

RoD

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prime number in python

Comment

# Python function to check if a number prime or not.
print("Welcome to Prime Number Checker")

def prime_check(number):
    prime = True
    for num in range(2, number):
        if number % num == 0:
            prime = False
    if prime:
        print("It is prime")
    else:
        print("It is not prime")

number_to_check = int(input("Type the number to check: "))
prime_check(number = number_to_check)

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Contributed on Dec 04 2022

Relieved Rattlesnake

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prime number in python

Comment

import math
a=[i for i in range(2,int(input('prime number range'))) if 0 not in [i%n for n in range(2,int(math.sqrt(i)))]]
print(a)

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Contributed on Jun 18 2021

Modern Mongoose

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prime number in python

Comment

# This shows how we can use for + else using a break in between

for x in range(1,101):
# if you want to find whether a user input is a prime number
# use the following insted of the first for loop
# x = int(input("Type a number: "))
    for i in range(2, x):
        if x % i == 0:
            print(x, "is not a prime number.")
            break
    else:
        print(x, "is a prime number.")

# This will print all the numbers from 1-100,
# in the same line will print whether it is a prime or not

# if you use the user input method
# when you type 9, the output will be:
# 9 is not a prime number.

# when you type 7, the output will be:
# 7 is a prime number.

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Contributed on Jun 04 2022

Rajitha Amarasinghe

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python is prime

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