import math
import sys
input = sys.stdin.buffer.readline
def prime_numbers(x):
    if x < 2:
        return []
    prime_numbers = [i for i in range(x)]
    prime_numbers[1] = 0
    for prime_number in prime_numbers:
        if prime_number > math.sqrt(x):
            break
        if prime_number == 0:
            continue
        for composite_number in range(2 * prime_number, x, prime_number):
            prime_numbers[composite_number] = 0
    return [prime_number for prime_number in prime_numbers if prime_number != 0]
prime = set(prime_numbers(5 * 10 ** 6))
t = int(input())
for _ in range(t):
    a, p = map(int, input().split())
    if p in prime:
        if a % p != 0:
            print(1)
        else:
            print(0)
    else:
        print(-1)