from collections import defaultdict


def Sieve_of_Eratosthenes(maxA):
    lst = [-1]*(maxA+1)
    lst[0] = 0
    lst[1] = 1
    for i in range(2, maxA+1):
        if lst[i] == -1:
            for g in range(i, maxA+1, i):
                if lst[g] == -1:
                    lst[g] = i
    return lst


maxA = 5*10**6 + 1
lst = Sieve_of_Eratosthenes(maxA)
t = int(input())
for _ in range(t):
    a, p = map(int, input().split())
    if p == lst[p]:
        if a % p != 0:
            print(1)
        else:
            print(0)
    else:
        print(-1)