P = [0] + [0] + [1] * (5 * 10 ** 6 - 1)

for i in range(2, 2500):
    
    if P[i]:
        
        for j in range(2 * i, 5 * 10 ** 6 + 1, i):
            
            P[j] = 0
            
import sys 
for _ in range(int(input())):
    
    a, p = map(int, sys.stdin.readline().split())
    
    if P[p]:
        
        if a % p:
            print(1)
            
        else:
            print(0)
            
    else:
        print(-1)