T = int(input())

limit = 5000000
is_prime = [True] * (limit + 1)
is_prime[0] = False
is_prime[1] = False

for p in range(0, limit + 1):
    if not is_prime[p]:
        continue
    for i in range(p * p, limit + 1, p):
        is_prime[i] = False


for i in range(T):
    A, P = map(int, input().split())
    if is_prime[P]:
        if A % P == 0:
            print(0)
        else:
            print(1)
    else:
        print(-1)