def isPrime(number):
    if number <= 3:
        if number <= 1:
            return False
        return True
    if not number % 2 or not number % 3:
        return False
    for i in range(5, int(number ** 0.5) + 1, 6):   
        if not number % i or not number % (i + 2):
            return False
    return True
def isPrime(number):
    if number <= 3:
        if number <= 1:
            return False
        return True
    if not number % 2 or not number % 3:
        return False
    for i in range(5, int(number ** 0.5) + 1, 6):   
        if not number % i or not number % (i + 2):
            return False
    return True