The Hebrew word for Law ('Torah') means 'guidance' or 'instruction', and that could include stories offering everyday examples of how people were meant to live as well as legal requirements.
They are not 'law' in a modern Western sense: Genesis is a book of stories, with nothing remotely like rules and regulations, and though the other four do contain community laws they also have many narratives.
The first five books, Genesis to Deuteronomy. It was traditionally arranged in three sections. The Hebrew Bible has 39 books, written over a long period of time, and is the literary archive of the ancient nation of Israel.
