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 <= 3 ){
            return number>1;
        }
        if(number % 6 != 1 && number % 6 !=5){
            return false;
        }
        for(int i = 5 ; i <= (int)Math.sqrt(number); i += 6){
            if(number % i == 0 || number % (i+2) == 0){
                return false;
            }
        }

        return true;
    

    }
}