Java program to find a given number is prime or not

import java.util.Scanner;

public class PrimeOrNot {

 public static void main(String[] args) {
  
  Scanner sc=new Scanner(System.in);
  
  System.out.println("Enter any valid integer :");
  int num=sc.nextInt();
  
  if(isPrime(num))
  {
   System.out.println(num+" is a prime number.");
  }
  else
   System.out.println(num+" is not a prime number.");
 }
 private static boolean isPrime(int num)
 {
  if(num<=0)
   return false;
  else if(num==2)
   return true;
  else
  {
   for(int i=3;i<(num);i++)
   {
    if(num%i==0)
    {
     return false;
    }
   }
  }
  return true;
  
 }
}