#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
#define REP(i,n) for(int i=0,_n=(int)(n);i<_n;++i)
#define ALL(v) (v).begin(),(v).end()
#define CLR(t,v) memset(t,(v),sizeof(t))
template<class T1,class T2>ostream& operator<<(ostream& os,const pair<T1,T2>&a){return os<<"("<<a.first<<","<<a.second<< ")";}
template<class T>void pv(T a,T b){for(T i=a;i!=b;++i)cout<<(*i)<<" ";cout<<endl;}
template<class T>void chmin(T&a,const T&b){if(a>b)a=b;}
template<class T>void chmax(T&a,const T&b){if(a<b)a=b;}

ll nextLong() { ll x; scanf("%lld", &x); return x;}
const int SIZE = 6*1000000;
vector<int> primes;
bool isPrime[SIZE];

void make_primes() {
  if (primes.size() > 0) return;
  memset(isPrime, true, sizeof(isPrime));
  isPrime[0] = isPrime[1] = false;
  for (int i = 2; i * i < SIZE; i++)
    if (isPrime[i])
      for (int j = i * i; j < SIZE; j += i)
        isPrime[j] = false;
  REP(i, SIZE) if (isPrime[i]) primes.push_back(i);
}

ll gcd(ll a, ll b) {
  if (b == 0) return a;
  return gcd(b, a % b);
}

int main2() {
  ll A = nextLong();
  ll P = nextLong();

  if (isPrime[P]) {
    if (gcd(A, P) == 1) {
      cout << 1 << '\n';
    } else {
      cout << 0 << '\n';
    }
  } else {
    cout << -1 << '\n';
  }
  return 0;
}

int main() {
  make_primes();
  int t = nextLong();
  while (t--)
    main2();
  return 0;
}