is_Prime = [True for i in range(5*10**6+1)]

is_Prime[0] = is_Prime[1] = False
for i in range(2, 5*10**6+1):
    if is_Prime[i] == False:
        continue
    for j in range(2, 5*10**6+1):
        if i*j > 5*10**6:
            break
        is_Prime[i*j] = False

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