# Title: Prime number check
# Heading: Python Program to Check a Prime Number
# Level: beginner
# Tags: prime number, trial division, divisors, square root
# About: Checks whether a number is prime by trying every divisor from 2 up to its square root.

def is_prime(number):
    """True if number is a prime number."""
    if number < 2:
        return False
    divisor = 2
    while divisor * divisor <= number:
        if number % divisor == 0:
            return False
        divisor += 1
    return True


print("29:", is_prime(29))
print("91:", is_prime(91))