import math
import random
import math
def eratosthenes(n):
    a = [True] * n
    a[0] = False
    a[1] = False
    for i in range(2, math.ceil(math.sqrt(n - 1))):
        if not a[i]:
            continue
        for j in range(2, (n - 1) // i + 1):
            a[i * j] = False
    return a
n = 5000001
Q = eratosthenes(n)
from sys import stdin
#print(Q[0])
t = int(input())
for i in range(t):
  a,p = map(int,stdin.readline().rstrip().split())
  if Q[p]:
    if a % p == 0:
      print(0)
    else:
      print(1)
  else:
    print(-1)