using System.Linq;
using System;

public class Hello
{
    static void Main()
    {
        var T = int.Parse(Console.ReadLine().Trim());
        var c = new bool[5000001];
        GeneratePrime(c);
        var ans = new int[T];
        for (int i = 0; i < T; i++)
        {
            string[] line = Console.ReadLine().Trim().Split(' ');
            var a = long.Parse(line[0]);
            var p = int.Parse(line[1]);
            if (!c[p]) ans[i] = -1;
            else ans[i] = a % p == 0 ? 0 : 1;
        }
        Console.WriteLine(string.Join("\n", ans));
    }

    static void GeneratePrime(bool[] p)
    {
        int prime;
        var m = p.Length;
        var sqrtMax = Math.Sqrt(m);
        var searchList = Enumerable.Range(2, m - 1).ToList();
        do
        {
            prime = searchList.First();
            p[prime] = true;
            searchList.RemoveAll(n => n % prime == 0);
        }
        while (prime < sqrtMax);
        foreach (var x in searchList)
            p[x] = true;
    }

}