wolfm2540 The answer would be no. If the room was searchable, it would not be hidden. If you're thinking, "Yes it would, because no one would know what to search for!" --- Strangers would still be able to access it via search. If the room title or even the usernames have the characters "e" in them for example, it could be found quite easily even if by mistake. All you need to do is type an "e" and it will show. So, it does not make sense to have hidden rooms searchable.
Unless your room is permanent/static, which could only be granted by an administrator or moderator, would you be able to keep the same URL. Even then, with the way chats like these are designed, the room will get glitchy with time and would need to be remade regardless.