No, you and your visitors can access your main page and all pages on your account either with or without the "www-dot" prefix.
On our servers as with most servers these days one can access the index
page on a given domain by entering the domain name without the www.
however as over the years so many users have gotten into the habit of
using the www. and enter it automatically our servers are setup to
recognize your domain name equally well either with or without the
third-level domain "www".
Both of the following will resolve to your account's index page:
