import sys
# import pypyjit
import itertools
import heapq
import math
from collections import deque, defaultdict
import string
import functools
import bisect

input = sys.stdin.readline
sys.setrecursionlimit(10 ** 6)
# pypyjit.set_param('max_unroll_recursion=-1')


def readints(): return map(int, input().split())
def readlist(): return list(map(int, input().split()))
def readstr(): return input()[:-1]


class PrimeTable:
    def __init__(self, N):
        self.is_prime = [True] * (N + 1)

        self.is_prime[0] = False
        self.is_prime[1] = False
        for i in range(2, N + 1):
            if i * i > N:
                break
            if self.is_prime[i] is False:
                continue
            for j in range(2, N + 1):
                if i * j > N:
                    break
                self.is_prime[i * j] = False

        self.primes = [n for n in range(2, N + 1) if self.is_prime[n]]


L = 5 * 10 ** 6
is_prime = PrimeTable(L).is_prime

T = int(input())
for _ in range(T):
    a, p = readints()
    if is_prime[p]:
        print(0 if a % p == 0 else 1)
    else:
        print(-1)