package Day09;
import java.util.Scanner;
public class Work04 {
public static void main(String[] args) {
Scanner n=new Scanner (System.in);
int num=n.nextInt ();
boolean zhishu=true;
for (int i = 2; i < num; i++) {
if (num%i==0){
zhishu=false;
break;
}
}
System.out.println (num+(zhishu?"是":"不是")+"质数");
}
}
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