Hi Michelle,
I can think of 2 main benefits of using words in URLs have instead of numbers.
If you are reading an article about Paella, and there is a list of recipes from different pages:
The second link is most likely to get more clicks. The same situation on Google search page, although the title is more important a readable URL will always be better to the user.
The second benefit for SEO purposes is that matching keywords from the title of you page and the URL will give you a boost, how much will be it is to discuss.
Here is an excellent MOZ article about the topic
https://moz.com/blog/15-seo-best-practices-for-structuring-urls
Hope it helps,
Carlos
