#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i = 0; i < (n);i++)
#define sz(x) int(x.size())
typedef unsigned long long ll;
typedef long double ld;
typedef pair<int,int> P;

int is_prime[5000001];

void init () {
  fill(is_prime, is_prime + 5000009, 1);
  is_prime[0] = is_prime[1] = 0;
  for (int i = 2; i <= 5000000; i++) {
    if (!is_prime[i]) continue;
    for (int j = i + i; j <= 5000000; j += i) is_prime[j] = 0;
  }
}

int main() {
  int t;
  cin >> t;
  init();

  while (t--) {
    ll a;
    int p;
    cin >> a >> p;
    if (is_prime[p]) cout << (a % p == 0 ? 0 : 1) << "\n";
    else cout << -1 << "\n";
  }
  return 0;
}