This question was asked in the Support board and I was glad to see it, because I had not thought of this before but it's a nice little mod to hide the admin account from the main member list on the People page.
Easy mod but backup people.php just in case.
Open people.php
Find:
//query for all members
$sqlquery = "SELECT * FROM member_profile WHERE account_status = 'active' ORDER BY user_id DESC";
Change to:
//query for all members
$sqlquery = "SELECT * FROM member_profile WHERE account_status = 'active' AND user_group = 'member' ORDER BY user_id DESC";