import math
def is_prime(n):
    if n == 1: return False
    for k in range(2, int(math.sqrt(n)) + 1):
        if n % k == 0:
            return False
    return True
T=int(input())
for i in range(T):
    A,P=map(int,input().split())
    if is_prime(P)==False:
        print(-1)
    else:
        if A%P==0:
            print(0)
        else:
            print(1)