You are given two positive integers a and b. Your task is to determine whether they are coprime. Two numbers are coprime if their greatest common divisor (GCD) is exactly 1.
Input: a = 8, b = 15
Output: Yes
Explanation: The GCD of 8 and 15 is 1. Therefore, the numbers are coprime.
Input: a = 12, b = 18
Output: No
Explanation: The GCD of 12 and 18 is 6, which is greater than 1. Therefore, the numbers are not coprime.
Input: a = 1, b = 100
Output: Yes
Explanation: The GCD of 1 and 100 is 1. Therefore, the numbers are coprime.
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