N = 5*(10**6)+1
E = [0 for _ in range(N)]
for i in range(2,N):
    for j in range(i,N,i):
        E[j] += 1
T = int(input())
for _ in range(T):
    A,P = map(int,input().split())
    if E[P] != 1:
        print(-1)
    else:
        if A%P != 0:
            print(1)
        else:
            print(0)