# 異常系（階乗全列挙不足）

P = 998244353

# 階乗
factorial = [1]
for i in range(1, 16 * 10**5 - 1):
    factorial.append(factorial[-1] * i % P)


# 二項係数
def comb(n, r):
    if n < r:
        return 0

    return factorial[n] * pow(factorial[r], P - 2, P) % P * pow(factorial[n - r], P - 2, P) % P


# 素因数の個数
def count_prime(n):
    count = 0

    while n % 2 == 0:
        n //= 2
        count += 1

    p = 3
    while p**2 <= n:
        if n % p == 0:
            n //= p
            count += 1
        else:
            p += 2

    if n > 1:
        count += 1

    return count


# solve
Q = int(input())
count = 0

for _ in range(Q):
    A, B = map(int, input().split())
    count += count_prime(A)
    print(comb(count - 1, B - 1))