#include<bits/stdc++.h>
using namespace std;
#define int long long
#define ii pair <int, int>
#define app push_back
#define all(a) a.begin(), a.end()
#define bp __builtin_popcountll
#define ll long long
#define mp make_pair
#define f first
#define s second
#define Time (double)clock()/CLOCKS_PER_SEC
#define debug(x) std::cout << #x << ": " << x << '\n';

const int C = 5e6+7;
bool p[C];

signed main() {
    #ifdef HOME
    freopen("input.txt", "r", stdin);
    #else
    #define endl '\n'
    ios_base::sync_with_stdio(0); cin.tie(0);
    #endif

    for (int i = 2; i < C; ++i)
        p[i] = 1;
    for (int i = 2; i < C; ++i) {
        if (p[i]) {
            for (int j = i * 2; j < C; j += i)
                p[j] = 0;
        }   
    }   

    int t;
    cin >> t;
    while (t--) {
        int a, pp;
        cin >> a >> pp;
        if (!p[pp]) {
            cout << -1 << endl;
        }
        else if (a % pp == 0)
            cout << 0 << endl;
        else
            cout << 1 << endl;
    }   
}