def Eratosthenes(N): #N以下の素数のリストを返す
    N+=1
    is_prime_list = [True]*N
    m = int(N**0.5)+1
    for i in range(3,m,2):
        if is_prime_list[i]:
            is_prime_list[i*i::2*i]=[False]*((N-i*i-1)//(2*i)+1)
    return [2] + [i for i in range(3,N,2) if is_prime_list[i]]

N = 5*10**6
ok = [0]*(N+1)
for i in Eratosthenes(N):
    ok[i] = 1

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