#include<iostream>
#include<string>
#include<queue>
#include<vector>
#include<cassert>
#include<random>
#include<set>
#include<map>
#include<cassert>
#include<unordered_map>
#include<bitset>
#include<numeric>
#include<algorithm>
using namespace std;
using ll = long long;
const int inf=1<<30;
const ll INF=1LL<<62;
typedef pair<int,ll> P;
typedef pair<int,P> PP; 
const ll MOD=998244353;
const int dy[]={0,1,0,-1};
const int dx[]={1,0,-1,0};


const int mod = 998244353;
struct mint {
  long long x; // typedef long long long long;
  mint(long long x=0):x((x%mod+mod)%mod){}
  mint operator-() const { return mint(-x);}
  mint& operator+=(const mint a) {
    if ((x += a.x) >= mod) x -= mod;
    return *this;
  }
  mint& operator-=(const mint a) {
    if ((x += mod-a.x) >= mod) x -= mod;
    return *this;
  }
  mint& operator*=(const mint a) { (x *= a.x) %= mod; return *this;}
  mint operator+(const mint a) const { return mint(*this) += a;}//後ろのconstはメンバxを変更しないことを示す
  mint operator-(const mint a) const { return mint(*this) -= a;}
  mint operator*(const mint a) const { return mint(*this) *= a;}
  bool operator==(const mint a) const {return a.x==x;}
  mint pow(unsigned long long int t) const {
    assert(t>=0);
    if (!t) return 1;
    //aがtで割り切れない場合には t%=(mod-1)をして良い
    mint a = pow(t>>1);
    a *= a;
    if (t&1) a *= *this;
    return a;
  }

  // for prime mod
  mint inv() const { return pow(mod-2);}
  mint& operator/=(const mint a) { return *this *= a.inv();}
  mint operator/(const mint a) const { return mint(*this) /= a;}
};

std::istream& operator>>(std::istream& is, mint& a) { return is >> a.x;}
std::ostream& operator<<(std::ostream& os, const mint& a) { return os << a.x;}



struct combination {
  std::vector<mint> fact, ifact;
  combination(int n):fact(n+1),ifact(n+1) {
    assert(n < mod);
    fact[0] = 1;
    for (int i = 1; i <= n; ++i) fact[i] = fact[i-1]*i;
    ifact[n] = fact[n].inv();
    for (int i = n; i >= 1; --i) ifact[i-1] = ifact[i]*i;
  }
  mint operator()(int n, int k) {
    if (k < 0 || k > n) return 0;
    return fact[n]*ifact[k]*ifact[n-k];
  }
};


combination comb(10*100000);



int main(){
    int Q;
    cin>>Q;
    vector<ll> A(Q),B(Q);
    for(int q=0;q<Q;q++){
        cin>>A[q]>>B[q];
    }
    auto add=[&](ll v){
        map<ll,ll> mp;
        for(ll d=2;d*d<=v;d++){
            if(v%d==0){
                while(v%d==0){ 
                    mp[d]++;
                    v/=d;
                }
            }
        }
        if(v!=1) mp[v]++;
        return mp;
    };

    ll cnt=0;
    vector<mint> ans(Q);

    for(int q=0;q<Q;q++){
        ll a=A[q],b=B[q];
        auto mp=add(a);
        for(auto p:mp){
            cnt+=p.second;
        }

        ll v=cnt-B[q];
        //仕切りの数がB[q]-1
        ans[q]=comb(v+B[q]-1,B[q]-1);
    }

    for(int q=0;q<Q;q++){
        cout<<ans[q]<<endl;
    }




}