def eratos(n):
    primes = list(range(n+1))
    primes[0] = -1
    primes[1] = -1

    for i in range(2, int(n**0.5) + 1):
        if primes[i] != i:
            continue
        for j in range(i*i, n+1, i):
            if primes[j] == j:
                primes[j] = i

    return primes

prime_table = eratos(5*10**6)

t = int(input())
ans = []
for _ in range(t):
    a, p = map(int, input().split())
    if prime_table[p] != p:
        ans.append(-1)
    else:
        if a % p == 0:
            ans.append(0)
        else:
            ans.append(1)

for i in ans:
    print(i)