如何确定一个数为素数

</pre><pre name="code" class="plain">import java.util.Scanner;public class Test {public static void main(String[] args) {Scanner input = new Scanner(System.in);int number;int isPrime=1;number = input.nextInt();for(int i =2;i<=number;i++){if(number % i ==0){isPrime = 0;System.out.println(number+"不是素数");break;}}if(isPrime == 1){System.out.println(number+"是素数");}else{System.out.println(number+"不是素数");}}}