import sys
input = sys.stdin.buffer.readline
def primes(n):
    is_prime = [True] * (n + 1)
    is_prime[0] = False
    is_prime[1] = False
    for i in range(2, int(n**0.5) + 1):
        if not is_prime[i]:
            continue
        for j in range(i * 2, n + 1, i):
            is_prime[j] = False
    return [i for i in range(n + 1) if is_prime[i]]
prime = set(primes(5 * 10 ** 6))
t = int(input())
for _ in range(t):
    a, p = map(int, input().split())
    if p in prime:
        if a % p != 0:
            print(1)
        else:
            print(0)
    else:
        print(-1)