That is not the password though. They call that the 'Security Number'.

After entering the two digits of the 'Security Number' you then receive a 'One Time Access Code' through a text or phone call, although I have never logged in to my account before, and seem to be unable to get past this step now.

I think you then enter your proper password in, which I would hope is not stored in plain text, although the article I linked seemed to imply this was the case back in 2012.