import random
import sys
sys.setrecursionlimit(10**6)
input = sys.stdin.readline

def is_prime(n):
    if n == 2: return True
    if n == 1 or n & 1 == 0: return False

    d = (n - 1) >> 1
    while d & 1 == 0:
        d >>= 1

    for k in range(100):
        a = random.randint(1, n - 1)
        t = d
        y = pow(a, t, n)

        while t != n - 1 and y != 1 and y != n - 1:
            y = (y * y) % n
            t <<= 1

        if y != n - 1 and t & 1 == 0:
            return False

    return True

t = int(input())
ans = [-1]*t
for i in range(t):
    a,p = map(int,input().split())
    if is_prime(p):
        ans[i] = 1
print("\n".join(str(i) for i in ans))