#yuki1140
MAX = 5*10**6 + 1

isprime = [1]*MAX
isprime[0] = isprime[1] = 0
for num in range(2, MAX):
    if isprime[num]:
        for k in range(num*2, MAX, num):
            isprime[k] = 0

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