typedef long long ll;
typedef long double ld;
#include <bits/stdc++.h>
using namespace std;
template< typename T >
T mod_pow(T x, T n, const T &p) {
  T ret = 1;
  while(n > 0) {
    if(n & 1) (ret *= x) %= p;
    (x *= x) %= p;
    n >>= 1;
  }
  return ret;
}
int main() {
    ll t;
    std::cin >> t;
    for (int di = 0; di < t; di++) {
        ll a,p;
        std::cin >> a>>p;
        bool prime = false;
        for (int i = 2; i <= sqrt(p); i++) {
           if(p%i==0){
                prime = true;
                break;
            }
        }
        if(prime){
            std::cout <<  mod_pow(a, p*(p+1)/2, p) << '\n';
        }else{
            std::cout << -1 << '\n';
        }
    }
}