Sorry, if your username isnt admin (older versions) you really dont need to do that.
What i would reccomend is for you to install 2-3 plugins
ordered here by their importance:
WordPress Firewall should stop must hack attempts directly on your site, Limit login should end any change of a brute login attemp and wp security should show you any loop holes in your file permission structure and othere stuff…
.
Hope this helps 🙂