Determine whether the number entered by the keyboard is a prime number
import java.util.Scanner;
public class ZhiShu {
public static void main(String[] args) throws Exception {
Scanner sc= new Scanner(System.in);
int num=sc.nextInt();
boolean flag=true;
for(int i=2;i<num;i++){
if(num%i==0){
flag=false;
break;
}
}
if(flag){
System.out.println("is a prime number");
}else{
System.out.println("Not a prime number");
}
}
}