How can i chek that the given number is prime or not.....plz suggest me a program

Question

it must be written I simple codes...plz

Answer 1

// Created by Andreas

/*
Author: Andreas
Created: 24. FEB 2018

Description: The code checks if you entered a prime number or not

++++++++++++++++++++++++++++++++
ENTER A NUMBER FOR "X". WHEN YOU RUN THE PROGRAM IT WILL TELL YOU IF YOU ENTERED A PRIME OR NOT.
++++++++++++++++++++++++++++++++
*/

public class Prime{
public static void main(String...arg){

int rest = 10;

int x = 7;
for(int i = 2;i < x/2+1 && rest != 0; i++) {
rest = x % i;
}
if(rest == 0)
{
System.out.println("Its not a prime number");
System.out.println(rest);
}
else
{
System.out.println("Its a prime number");
System.out.println(rest);
}
}
}