def main():
    import sys
    input = sys.stdin.buffer.readline

    def is_prime(n):
        """
        input: n > 0
        output: True if n is prime,otherwise False
        """
        if n == 1:
            return False
        for i in range(2, n+1):
            if i*i > n:
                break
            if n % i == 0:
                return False
        return True

    T = int(input())
    for _ in range(T):
        A, P = (int(i) for i in input().split())
        if not is_prime(P):
            print(-1)
            continue
        if A % P != 0:
            print(1)
        else:
            print(0)


if __name__ == '__main__':
    main()