import java.io.BufferedReader
import java.io.InputStream
import java.io.InputStreamReader
import java.io.PrintWriter
import java.util.*

fun PrintWriter.solve(sc: FastScanner) {
    val t = sc.nextInt()
    val size = 5000005
    val isprime = BitSet(size)
    for (i in 2 until size) {
        isprime[i] = true
    }
    for (i in 2 until size) {
        if (isprime[i]) {
            var j = 2
            while (i * j < size) {
                isprime[i * j] = false
                j++
            }
        }
    }
    for (_i in 0 until t) {
        val a = sc.nextLong()
        val p = sc.nextInt()
        if (!isprime[p]) {
            println(-1)
        } else if (a % p == 0L) {
            println(0)
        } else {
            println(1)
        }
    }
}

fun main() {
    val writer = PrintWriter(System.out, false)
    writer.solve(FastScanner(System.`in`))
    writer.flush()
}

class FastScanner(s: InputStream) {
    private var st = StringTokenizer("")
    private val br = BufferedReader(InputStreamReader(s))

    fun next(): String {
        while (!st.hasMoreTokens()) st = StringTokenizer(br.readLine())

        return st.nextToken()
    }

    fun nextInt() = next().toInt()
    fun nextLong() = next().toLong()
    fun nextLine() = br.readLine()
    fun nextDouble() = next().toDouble()
    fun ready() = br.ready()
}