I guess yes. You can create anonymous FTP accounts, which is easy to setup by using your online control panel, You can set it up on any or all of your domains. A dedicated IP address is no longer required to enable anonymous FTP.
In short : Yes. You will be able to access your domain address with or without www prefix. For example. You can access http://www.yourdomain.com or http://yourdomain.com both are acceptable. It is just a matter of preference, as to which you will use.