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......
    //质数：一个数的约数只有1和它本身
    if(number < 2 || number % 2 == 0){
        return false;
    }else if(number == 2){
        return true;
    }else{
        for(int i = 3;i <= Math.sqrt(number);i += 2){
            if(number % i == 0){
                return false;
            }
        }
        return true;
    }
}

}