Prime Number

/* Program to check for a prime number*/
import java.util.Scanner;
class Prime
{
static boolean isPrime(int num)
{
int i,flag=0;
for(i=2;i<=(num/2);i++)
{
if((num%i)==0)
   return false;
}
return true;
}
public static void main(String args[])
{
Scanner sc=new Scanner(System.in);
System.out.println("Enter a number");
int n=sc.nextInt();
if(isPrime(n))
System.out.println("Yes a prime number");
else
System.out.println("Not a prime number");
}
}