#include<cstdio>#include<cstring>#include<cstdlib>#include<iostream>#include<algorithm>using namespace std;long long n;long long  read(){    long long x=0,f=1; char ch=getchar();    while(ch<‘0‘||ch>‘9‘){if(ch==‘-‘) f=-1; ch=getchar();}    while(ch>=‘0‘&&ch<=‘9‘) {x=x*10+ch-‘0‘; ch=getchar();}    return x*f;}bool pd(long long x){    if(x==1) return false;    for(long long j=2;j*j<=x;j++)     if(x%j==0) return false;    return true;}int main(){    n=read();    if(pd(n)) printf("Yes");    else printf("No");    return 0;}