Single Sign-On Clarification

If we enable single sign-on, is it possible to prohibit users from logging into the platform using their username and password once SSO is in place? (Disable login via username and password in favour of SSO.)

Ideally, for ALL users. (Even the user which initially created the account.)

I am not very familiar with SSO, so perhaps the answer is clear enough from the documentation, but it wasn't obvious to me. (Based on my limited knowledge of SSO.)