is_prime python Code Snippet in 2025

Checks if the provided integer is a prime number.

• Return False if the number is 0, 1, a negative number or a multiple of 2.
• Use all() and range() to check numbers from 3 to the square root of the given number.
• Return True if none divides the given number, False otherwise.

from math import sqrt

def is_prime(n):
  if n <= 1 or (n % 2 == 0 and n > 2): 
    return False
  return all(n % i for i in range(3, int(sqrt(n)) + 1, 2))

is_prime(11) # True