import sys
input = sys.stdin.readline
def main():
    MX_T=500000
    MX_P=5000000
    MX_A=1000000000000000000
    isprime=[True]*(MX_P+1)
    isprime[0]=isprime[1]=False
    for n in range(2,MX_P+1):
        if isprime[n]:
            s=2*n
            while s<=MX_P:
                isprime[s]=False
                s+=n
    T=int(input())
    assert(1<=T<=MX_T)
    for _ in range(T):
        A,P=map(int,input().split())
        assert(1<=A<=MX_A)
        assert(1<=P<=MX_P)
        if isprime[P]:
            print(0 if A%P==0 else 1)
        else:
            print(-1)
if __name__=='__main__':
    main()