#include <bits/stdc++.h>
using namespace std;
int main(){
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  int T;
  cin >> T;
  vector<bool> prime(5000001, true);
  prime[0] = false;
  prime[1] = false;
  for (int i = 2; i <= 5000000; i++){
    if (prime[i]){
      for (int j = i * 2; j <= 5000000; j += i){
        prime[j] = false;
      }
    }
  }
  for (int i = 0; i < T; i++){
    long long A;
    int P;
    cin >> A >> P;
    if (!prime[P]){
      cout << -1 << "\n";
    } else if (A % P == 0){
      cout << 0 << "\n";
    } else {
      cout << 1 << "\n";
    }
  }
}