import sys
import numpy as np

input = sys.stdin.buffer.readline

table_len = 5000005
table = np.full(table_len, True)
table[0] = False
table[1] = False
for i in range(2, table_len):
    if table[i]:
        table[2*i::i] = False


T = int(input())
for _ in range(T):
    A, P = map(int, input().split())
    if table[P]:
        print(1 if A % P else 0)
    else:
        print(-1)