Facebook and Facebook Messenger can't be deleted?

Forgive me if this is known already, but coming from the nexus 6 I was able to uninstall the Facebook app and messenger when I didn't want it.. I decided yesterday I was just going to bookmark Facebook and add a shortcut to the home screen for it. When I went to delete the app, I noticed I wasn't able to uninstall it. I have disabled both Facebook and messenger in application settings, however... I'd like to known if I can completely uninstall it.

This may not be specific to the note 5, buy that's the phone I'm using at the moment.

Thanks.