Checks if the given number is prime

is_prime.py

import sys
import math

def is_prime(number):
    if number <= 1:
        return False

    if number == 2:
        return True

    if number % 2 == 0:
        return False

    for current in range(3, int(math.sqrt(number) + 1), 2):
        if number % current == 0:
            print "Divisible by ", current
            return False
    return True


if __name__ == "__main__":
    if len(sys.argv) >= 2:
        print is_prime(int(sys.argv[1]))