题解 | #判断质数#

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Main main = new Main();
        Scanner scan = new Scanner(System.in);
        int number = scan.nextInt();
        System.out.println(main.isPrimeNumber(number));
    }

    public Boolean isPrimeNumber(int number) {

        //write your code here......
        if(number == 2)
        {
            return true;
        }
        for(int i = 2; i <= Math.sqrt(number); i++)
        {
            if(number % i == 0)
            {
                return false;
            }
        }

        return true;

    }
}

加偶数判断好像没必要，循环里面第一次就是偶数判断