import math

t = int(input())

m = 5000000

prime = [True for _ in range(m + 1)]
prime[1] = False

for x in range(2, m + 1):
  if not prime[x]:
    continue
  prime[x] = True
  for y in range(2 * x, m + 1, x):
    prime[y] = False

ans = []
for _ in range(t):
  a, p = map(int, input().split())
  if not prime[p]:
    ans.append(-1)
  elif math.gcd(a, p) == 1:
    ans.append(1)
  else:
    ans.append(0)

print(*ans, sep='\n')