#include<bits/stdc++.h>

using namespace std;
using ll = long long;

int MAX = 1e7;
vector<char> prime(MAX+1);
void f() {
    for(int i = 2; i <= MAX; i++) {
        if(prime[i])continue;
        for(int j = i + i; j <= MAX; j += i)prime[j] = true;
    }
}


void solve() {

    ll a, p;
    cin >> a >> p;
    if(prime[p]) {
        cout << -1 << endl;
    }
    else if(a % p == 0LL) {
        cout << 0 << endl;
    } else {
        cout << 1 << endl;
    }
}

int main()
{
    cin.tie(0);ios::sync_with_stdio(0);
    f();
    int T;
    cin >> T;
    while(T--)solve();
}