import collections

def primes_ordered_dict(n):
    #
    prime_list = []
    non_prime_list = []
    number_dict = collections.OrderedDict(
        ((i, None) for i in range(n + 1)))
    #
    del number_dict[0]
    del number_dict[1]
    while True:
        # get prime
        prime, _ = number_dict.popitem(False)
        prime_list.append(prime)
        # break
        if not (prime * prime <= n):
            break
        # get non primes
        non_prime_list.append(prime * prime)
        for k in number_dict:
            if prime * k <= n:
                non_prime_list.append(prime * k)
            else:
                break
        # delete non primes
        for non_prime in non_prime_list:
            del number_dict[non_prime]
        non_prime_list.clear()

    # add rest of numbers as prime
    prime_list.extend(
        [prime for prime, _ in number_dict.items()])

    return prime_list

N = 5*(10**6)+1
E = primes_ordered_dict(N)
T = int(input())
for _ in range(T):
    A,P = map(int,input().split())
    if P not in E:
        print(-1)
    else:
        if A%P != 0:
            print(1)
        else:
            print(0)