Find prime numbers in java

package primeexample;
import java.util.Scanner;
class PrimeExample{
 public static void main(String args[]){
     Scanner b = new Scanner(System.in);
  int i,m=0,flag=0;  
  int n;
  System.out.println("Enter an integer");
  n=b.nextInt();
  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");  
}
}