Mbpp/605

import math
def prime_num(n: int) -> bool:
    """
    Return True if n is a prime number, False otherwise.
    
    A prime number is a natural number greater than 1 that has no positive
    divisors other than 1 and itself.
    """
    # Handle numbers less than 2 (not prime)
    if n < 2:
        return False
    # 2 is prime
    if n == 2:
        return True
    # Even numbers greater than 2 are not prime
    if n % 2 == 0:
        return False
    # Check odd divisors up to sqrt(n)
    for i in range(3, math.isqrt(n) + 1, 2):
        if n % i == 0:
            return False
    return True

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