#include<iostream>
#include<stdio.h> 
#include<string.h> 
#include<queue> 
#include<math.h>
#include<vector> 
#include<algorithm> 
#include<iomanip> 
#include<stack>
#include<cmath>
using namespace std;
bool pdss(int x){
	bool flag=1;
	for(int i=2;i<=sqrt(x);i++){
		if(x%i==0){
			flag=0;
			break;
		}

	}	
	return flag;
}
int main(){
	int n;
	cin>>n;
	if(pdss(n)==1&&n>1)cout<<"Yes";
	else cout<<"No";	
}

#include<iostream> #include<cmath> using namespace std; int main() { int n; bool sum=1; cin>>n; for(int i=2;i<=sqrt(n);i++){ if(n%i0) { sum=0; break; } } if(sum1&&n>1)cout<<"Yes"; else cout<<"No"; return 0; }

import math
n=int(input())
zhishu=True
if n==1:
    print("No")
elif n==2 or n==3:
    print("Yes")
elif n>3:
    i=3;
    while(i<=int(math.sqrt(n))+1):
        if n%i==0:
            print("No")
            zhishu=False
            break
        i+=2;
    if zhishu:
        print("Yes")

注意n=1时要特判

n = int(input())
ok=1
for i in range(2,n):
    if i*i>n:
        break
    elif n%i==0:
        print("No")
        ok=0
        break
if(ok and n!=1):
    print('Yes')
if n==1:
    print('No')

import math
n=int(input())
zhishu=True
if n==1:
    print("No")
elif n==2 or n==3:
    print("Yes")
elif n>3:
    i=3;
    while(i<=int(math.sqrt(n))+1):
        if n%i==0:
            print("No")
            zhishu=False
            break
        i+=2;
    if zhishu:
        print("Yes")