Testing given number to be a prime.

    >>> [n for n in range(100+1) if is_prime(n)]
    [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97]

def is_prime(number):
    """
    Testing given number to be a prime.

    >>> [n for n in range(100+1) if is_prime(n)]
    [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97]
    """
    if number < 2:
        return False
    if number % 2 == 0:
        return number == 2

    limit = int(math.sqrt(number))
    for divisor in range(3, limit + 1, 2):
        if number % divisor == 0:
            return False

    return True