import sys

input=sys.stdin.buffer.readline

def primes(n):
    is_prime = [True] * (n + 1)
    is_prime[0] = False
    is_prime[1] = False
    for i in range(2, int(n**0.5) + 1):
        if not is_prime[i]:
            continue
        for j in range(i * 2, n + 1, i):
            is_prime[j] = False
    l = [False]*(n+1)
    for i in range(n+1):
        if is_prime[i]:
            l[i] = True

    return l

N = 5*(10**6)+1
E = primes(N)

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