import sys
input = sys.stdin.readline

def sieve(n):
    res = [True for _ in range(n + 1)]
    res[0] = False
    res[1] = False
    i = 2
    while i * i <= n:
        if res[i]:
            for j in range(i * 2, n + 1, i):
                res[j] = False
        i += 1
    return res

T = int(input())
S = sieve(5 * 10**6)

res = []

for _ in range(T):
    a, p = map(int, input().split())
    if not S[p]:
        res.append(-1)
    else:
        if a % p == 0:
            res.append(0)
        else:
            res.append(1)

print('\n'.join(map(str, res)))