import sys
input = sys.stdin.buffer.readline

prime = [True for _ in range(5 * 10 ** 6 + 1)]
prime[0] = prime[1] = False
for i in range(2, 5 * 10 ** 6 + 1):
    if not prime[i]:
        continue
    for j in range(2 * i, 10 ** 6 + 1, i):
        prime[j] = False

t = int(input())
for _ in range(t):
    a, p = map(int, input().split())
    if prime[p]:
        if a % p == 0:
            print(0)
        else:
            print(1)
    else:
        print(-1)