#include <bits/stdc++.h>
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define printVec(v) printf("{"); for (const auto& i : v) { std::cout << i << ", "; } printf("}\n");
#define degreeToRadian(deg) (((deg)/360)*2*M_PI)
#define radianTodegree(rad) (((rad)/2/M_PI)*360)
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
using namespace std;
using P = pair<int,int>;
using ll = long long;
const ll INF = 1LL<<60;
const int MOD = 1e9 + 7;
const int dx[4] = {1, 0, -1, 0};
const int dy[4] = {0, 1, 0, -1};

//cin.tie(0);ios::sync_with_stdio(false);
//cout << fixed << setprecision(15) << y << endl;

int main() {
  cin.tie(0);ios::sync_with_stdio(false);
  int t;
  scanf("%d", &t);

  const int max = 5000010;
  vector<int> ans;
  vector<bool> pn(max, true);

  for (int i = 2; i < max; i++) {
    if (!pn[i]) continue;
    for (int j = 2; i * j < max; j++) {
      pn[i * j] = false;
    }
  }

  
  for (int i = 0; i < t; i++) {
    ll a, p;
    scanf("%lld %lld", &a, &p);
    if (pn[p]) {
      if (a % p == 0) {
	ans.push_back(0);
      } else {
	ans.push_back(1);
      }
    } else {
      ans.push_back(-1);
    }
  }

  for (auto v : ans) {
    cout << v << endl;
  }
  return 0;
}