from math import sqrt
from itertools import accumulate
N = 5*(10**6)+1
l = [i for i in range(N)]
al = list(accumulate(l))
T = int(input())
for _ in range(T):
    A,P = map(int,input().split())
    flg = False
    for i in range(2,int(sqrt(P)+1)):
        if P%i == 0:
            flg = True
            break
    if flg:
        print(-1)
    else:
        a = A%P
        ans = a**al[P]%P
        print(ans)