import math
import random
import math
n = 5000001
A=list(range(2,n+1))
Q=list()
while A[0]**2<=n:
	tmp=A[0]
	Q.append(tmp)
	A=[e for e in A if e%tmp!=0]
from sys import stdin
#print(Q[0])
Q = set(Q)
t = int(input())
for i in range(t):
  a,p = map(int,stdin.readline().rstrip().split())
  if p in Q:
    if a % p == 0:
      print(0)
    else:
      print(1)
  else:
    print(-1)