ll@N,@M,@A[N],@(U--,V--)[M],a,b,s=1,m=998244353;
unionFind f('m',N,1);
rep(i,M)f(U[i],V[i]);
rep(i,N)if(i!=f(i))A[f(i)]+=A[i];
rep(i,N)(s*=A[f(i)]%m)%=m;
wt(s);