#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<n;i++)
using namespace std;
typedef long long ll;
const int MOD = 998244353;
const ll INF = 4611686018427387903LL;
int main()
{
  
  std::vector<int> prime, mip(5000000 + 1); mip[0] = mip[1] = -1;
    for(int i = 2; i < mip.size(); i++) {
        if(mip[i] == 0) {
            mip[i] = i;
            prime.push_back(i);
        }
        
        for(int j = 0; j < prime.size() and prime[j] <= mip[i] and i * prime[j] <= mip.size(); j++) {
            mip[i * prime[j]] = prime[j];
        }
    }

    auto pfact = [&](int x) {
        std::vector<std::pair<int, int>> vec;
        while(x > 1) {
            if(vec.empty() or vec.back().first != mip[x]) {
                vec.push_back({mip[x], 1});
            } else {
                vec.back().second++;
            }
            x /= mip[x];
        }
        return vec;
    };
  int T;cin >> T;
  while (T--)
  {
    ll a;int p;
    cin >> a >> p;
    auto fac=pfact(p);
    if(fac.size()==1&&fac[0].first==p){
      cout << (a%p==0?0:1) << endl;
    }
    else{
      cout << -1 << endl;
    }
  }
  
  return 0;
}