No. Orthodoxy has historically interpreted the creation story as inspired revelation, metaphor, and not as a literal historical record. 7 is a number that symbolises completeness and divine perfection.
However, you will find many Christians who do in fact take it literally.
Part of the beauty of the story is that you can read it both ways, and it changes nothing.
The main point, or central idea, stays the same - and that is that God created the world. How God did it, in a technical sense, is really irrelevant.