#include <bits/stdc++.h> 
using namespace std;
using ll =long long;
#define all(v) v.begin(),v.end()
 #define rep(i,a,b) for(int i=a;i<b;i++)
#define rrep(i,a,b) for(int i=a;i>=b;i--)

ll INF=2e18;
ll N=5e6;
vector<bool> note(N+1,false);

void solve() {
ll A,P;cin>>A>>P;
if(note[P]) cout<<-1<<endl;
else if(A%P==0) cout<<0<<endl;
else cout<<1<<endl;



}

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  note[0]=true;
  note[1]=true;
  for(ll i=2;i<=N;i++) {
    if(note[i]) continue;
    else {
      for(ll j=2;j*i<=N;j++) {
        note[j*i]=true;
      }
    }
  }

    ll t;cin>>t;
    for(ll i=0;i<t;i++) {
        solve();
    }
}