root is the superuser in unix and can do about everything. We need root rights to perform advanced administration in unix platforms and there are multiple users doing it. Anyone with root login can perform destructive steps (Like running "rm -rf /") which can go untraced on who did it! In order to avoid it, this step is done and to ensures that no one log's in directly as root.
The best practice is to login as a user and perform switch user operation to root for administration rights.
Do the following steps
# vi /etc/default/login
* go to CONSOLE= /dev/console
* remove /dev/console
Save and exit
Now root cannot directly login to this system.
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