判断一个数是否素数

package ali;import java.util.Scanner;public class zuoye {       public static void main(String[] args){               int n;               Scanner sca=new Scanner(System.in);               System.out.println("please input anumber:");               n=sca.nextInt();               if(isPrimeNumber(n)){                      System.out.println(n+"is a prime number!");               }else{                      System.out.println(n+"is not a prime number!");               }        }       public static boolean isPrimeNumber(int n){               for(int i=2;i<=n/2;i++){                      if(n%i==0){                       return false;                  }               }                  return true;        }    }

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