import sys
input = sys.stdin.readline

def main():
    def Sieve_of_Eratosthenes(maxA):
        lst = [None]*(maxA+1)
        lst[0] = False
        lst[1] = False
        for i in range(2, maxA+1):
            if lst[i] is None:
                for g in range(i, maxA+1, i):
                    if lst[g] is None:
                        lst[g] = False
                lst[i] = True
        return lst


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

if __name__ == '__main__':
    main()