WAP to check wether a given number is prime or not in java

import java.io.*;
class Prime
{
public static void main(String args[])
{
  BufferedReader bf=new BufferedReader(new InputStreamReader(System.in));
  int n=0;
try
{
System.out.println("Enter The Number");
n=Integer.parseInt(bf.readLine());
}
catch(Exception e)
{
e.printStackTrace();
}
  int i,m=0,flag=0; 
    m=n/2; 
  for(i=2;i<=m;i++)
{ 
    if(n%i==0)
{ 
                                System.out.println("Number is not prime"); 
    flag=1; 
    break; 
  } 
  } 
  if(flag==0) 
  System.out.println("Number is prime"); 
}
}