#include <iostream> // cout, endl, cin
#include <string> // string, to_string, stoi
#include <vector> // vector
#include <algorithm> // min, max, swap, sort, reverse, lower_bound, upper_bound
#include <utility> // pair, make_pair
#include <tuple> // tuple, make_tuple
#include <cstdint> // int64_t, int*_t
#include <cstdio> // printf
#include <map> // map
#include <queue> // queue, priority_queue
#include <set> // set
#include <stack> // stack
#include <deque> // deque
#include <unordered_map> // unordered_map
#include <unordered_set> // unordered_set
#include <bitset> // bitset
#include <cctype> // isupper, islower, isdigit, toupper, tolower
#include <iomanip> // setprecision
#include <complex> // complex
#include <math.h> 
#define enld '\n'
using namespace std;
using ll = long long;
using P = pair<int,int>;
constexpr ll INF = 1e18;
constexpr int inf = 1e9;
constexpr ll mod = 1000000007;
constexpr ll mod2 = 998244353;
const int dx[8] = {1, 0, -1, 0,1,1,-1,-1};
const int dy[8] = {0, 1, 0, -1,1,-1,1,-1};
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; }
// ---------------------------------------------------------------------------


int main(){
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  int _;
  cin >> _;
  vector<int> era(5010000,0);
  era[0] = era[1] = 1;
  for(int i=2; i<=5001000; i++){
    if(era[i] == 0){
      for(ll j=i+i; j<=5001000; j+=i){
        era[j] = 1;
      }
    }
  }
  while(_--){
    ll A,P;
    cin >> A >> P;
    if(era[P]){
      cout << -1 << "\n";
      continue;
    }
    if(A%P == 0){
      cout << 0 << "\n";
    }else{
      cout << 1 << "\n";
    }
  }


  return 0;
}