def eratosthenes_sieve(n):
    table = [0] * (n+1)
    prime_list = []
    for i in range(2, n+1):
        if table[i] == 0:
            prime_list.append(i)
            for j in range(i+i, n+1, i):
                table[j] = 1
    return prime_list

N = 5*(10**6)+1
E = set(eratosthenes_sieve(N))
T = int(input())
for _ in range(T):
    A,P = map(int,input().split())
    if P not in E:
        print(-1)
    else:
        if A%P != 0:
            print(1)
        else:
            print(0)