class CP:
    def __init__(self, N):
        self.fact = [1]
        self.fact_inv = [1]
        for i in range(1, N+1):
            self.fact.append((self.fact[-1]*i)%MOD)
            self.fact_inv.append(pow(self.fact[-1], -1, MOD))
    def C(self, N, K):
        if N >= K:
            return self.fact[N]*self.fact_inv[K]%MOD*self.fact_inv[N-K]%MOD
        else:
            return 0
    def P(self, N, K):
        if N >= K:
            return self.fact[N]*self.fact_inv[N-K]%MOD
        else:
            return 0

class Eratosthenes:
    def __init__(self, n):
        self.isPrime = [True]*(n+1)
        self.minfactor = [-1]*(n+1)
        self.isPrime[0], self.isPrime[1] = False, False
        self.minfactor[1] = 1
        for i in range(2, n+1):
            if self.isPrime[i]:
                self.minfactor[i] = i
                for j in range(i*2, n+1, i):
                    self.isPrime[j] = False
                    if self.minfactor[j] == -1:
                        self.minfactor[j] = i
    
    def factorize(self, n):
        factor = []
        C = 0
        while n > 1:
            p = self.minfactor[n]
            cnt = 0
            while self.minfactor[n] == p:
                n //= p
                cnt += 1
            factor.append((p, cnt))
            C += cnt
        return C
    
    def divisor(self, n):
        ans = [1]
        pf = self.factorize(n)
        for p, c in pf:
            L = len(ans)
            for i in range(L):
                v = 1
                for _ in range(c):
                    v *= p
                    ans.append(ans[i]*v)
        return sorted(ans)

Q = int(input())
AB = [list(map(int, input().split())) for _ in range(Q)]

MOD = 998244353
E = Eratosthenes(10**5)
cp = CP(10**6*2)
cnt = 0
for A, B in AB:
    cnt += E.factorize(A)
    print(cp.C(cnt-1, B-1))