256 database usage and some problem

Hello,

I have created 256 databases. Everything working fine right now. But I login to phpmyadmin and have seen that most of the databases have no tables. So is it a problem? Dont they need to have tables that are in db_config?

Secondly, I am not sure if I am using multi database or my old single database for ra6.org ?How can I learn this?
Regards,
Mustafa