import numpy as np
import sys

input = sys.stdin.readline


def primes_np(n):
    is_prime = np.ones(n + 1, dtype=bool)
    is_prime[0] = False
    is_prime[1] = False
    for i in range(2, int(n ** 0.5) + 1):
        if not is_prime[i]:
            continue
        is_prime[i * 2:n + 1:i] = False
    return np.where(is_prime)[0].tolist()


PR = set(primes_np(5 * 10 ** 6))
T = int(input())
for _ in range(T):
    A, P = map(int, input().split())
    if P in PR:
        print(1 if A % P else 0)
    else:
        print(-1)