#include <iostream>
#include <cstdint>
#include <vector>

using namespace std;

int main()
{
	cin.tie(nullptr);
	ios::sync_with_stdio(false);

	uint32_t T, i;
	cin >> T;
	vector<uint64_t> A(T);
	vector<uint32_t> P(T);
	for (i = 0; i != T; ++i)
		cin >> A[i] >> P[i];

	vector<bool> is_prime(5000001, true);
	is_prime[0] = is_prime[1] = false;
	for (i = 2; i <= 5000000; ++i)
		if (is_prime[i])
			for (uint32_t j = i * 2; j <= 5000000; j += i)
				is_prime[j] = false;

	for (i = 0; i != T; ++i)
	{
		if (!is_prime[P[i]]) cout << "-1\n";
		else if (A[i] % P[i] == 0) cout << "0\n";
		else cout << "1\n";
	}

	return 0;
}