import sys
readline = sys.stdin.readline
from math import *

def Sieve(n):
    lst = [True] * (n + 1)
    S = set()
    for i in range(2, ceil(sqrt(n)) + 1):
        if lst[i]:
            for j in range(2 * i, n + 1, i):
                lst[j] = False
    for i in range(2, n + 1):
        if lst[i]:
            S.add(i)
    return S


T = int(readline())
S = Sieve(5050505)
for _ in range(T):
    A, P = map(int, readline().split())
    if P not in S:
        print(-1)
    else:
        if A % P:
            print(1)
        else:
            print(0)