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"""
        sup = int(x)
        primes = [True for i in range(sup+1)]
        primes[0] = False
        primes[1] = False
        for i in range(2, sup+1):
            if sup < i*i:
                break
            if primes[i]:
                mul = 2
                while i*mul <= sup:
                    primes[i*mul] = False
                    mul += 1
        return {i for i in range(sup+1) if primes[i]}

    primes = Eratosthenes(5*10**6)

    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()