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

    def Eratosthenes(x: int) -> set:
        """x以下の素数の集合を返す"""
        from math import sqrt
        sup = int(x)
        primes = {i for i in range(2, sup+1)}
        for i in range(2, int(sqrt(sup+1))+1):
            if i in primes:
                mul = 2
                while i*mul <= sup:
                    primes.discard(i*mul)
                    mul += 1
        return primes

    primes = Eratosthenes(5*10**6 + 5)

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


if __name__ == '__main__':
    main()