from collections import defaultdict
def prime_table():
    don = [1 for i in range(5*(10**6)+1)]
    don[0]=0
    don[1]=0
    for i in range(2,5*(10**6)+1):
        if(don[i]):
            for j in range(i+i,5*(10**6)+1,i):
                don[j] = 0
    return don

hurui = prime_table()
t = int(input())
res = []
for i in range(t):
    a,p=map(int, input().split())
    if(not hurui[p]):
        res.append(-1)
    else:
        if(a%p==0):
            res.append(0)
        else:
            res.append(1)
for i in res:
    print(i)