#include<bits/stdc++.h>
// #include<atcoder/all>
using namespace std;
// using namespace atcoder;
using lint = long long;
long const mod = 1e9+7;
//long const mod = 998244353;
void solve(){
    lint a,p;
    cin >> a >> p;
    for(int i=2;i<=sqrt(p);i++){
        if(p%i == 0){
            cout << -1 << endl;
            return;
        }
    }
    if(a%p==0){
        cout << 0 << endl;
        return;
    }else{
        cout << 1 << endl;
    }

    



}
int main(){
    lint t;
    cin >> t;
    for(int i=0;i<t;i++){
        solve();
    }
}