1702 素数判定 2

#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;
}