Prime number program in java

Java program to check whether given number is prime number or not


import java.io.*;

class Test {
     public static void main(String[] args) throws IOException {
          int num,i,count=0;
          System.out.println("Enter a number");
          BufferedReader br=new BufferedReader(new InputStreamReader (System.in));
          num=Integer.parseInt(br.readLine());

          for(i=1;i<=num;i++){
              if(num%i==0)
                   count++;
          }

          if(count==2)
              System.out.println(num+" is a prime number");
          else
              System.out.println(num+"is not a prime number");
     }
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