#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <utility>
#include <map>
#include <set>
#include <queue>
#include <iomanip>
#include <cstring>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
typedef long long ll;
#define rep(i,n) for (int i = 0; i < int(n);i++)

int main(){
  vector<bool> prime(5000002,true);
  prime[1] = false;
  prime[2] = true;
  for (int i = 2; i <= 5000000;i++){
    for (int j = i+i; j <= 5000000;j+=i){
      prime[j] = false;
    }
  }
  int t;
  cin >> t;
  while(t--){
    ll a,p;
    cin >> a >> p;
    if (prime[p]){
      if (a%p == 0){
        cout << 0 << endl;
      }
      else cout << 1 << endl;
    }
    else cout << -1 << endl;
  } 
  return 0;
}