Looks like the server is not recognizing that you are submitting the password - are you trying to connect to via the command line?
If so, your command might look like this:
mysql -uroot -pPASSWORDHERE database_name
Notice how there is no space between the
-p flags and the information we are submitting, user name and password. This is my goto format for accessing mysql on the command line (although rarely as the root user once set up).
I would also mention that your mysql password and other helpful information should be displayed when you login via SSH, in the MOTD or message of the Day information. More info in this older answer, too, if you’re still stuck:
Hope this helps and good luck!