#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define pb push_back
#define fi first
#define se second
typedef pair<ll, ll> P;
using VP = vector<P>;
using VVP = vector<VP>;
using VI = vector<ll>;
using VVI = vector<VI>;
using VVVI = vector<VVI>;
const int inf = 1e9 + 7;
const ll INF = 1LL << 61;
const ll mod = 1e9 + 7;

template <class T> inline bool chmax(T &a, T b) {
    if (a < b) {
        a = b;
        return true;
    }
    return false;
}

template <class T> inline bool chmin(T &a, T b) {
    if (a > b) {
        a = b;
        return true;
    }
    return false;
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int i, j;
    int m = 5050505;
    vector<bool> prime(m, 1);
    for (i = 2; i < m; i++) {
        for (j = 2; i * j < m; j++) prime[i * j] = 0;
    }
    int t;
    cin >> t;
    while (t--) {
        ll a, p;
        cin >> a >> p;
        if (prime[p]) {
            if (a % p == 0)
                cout << 0;
            else
                cout << -1;
        } else
            cout << 1;
        cout << endl;
    }
}