Does Anyone Know What Plug In This Site is Running?

Im new to wordpress and not sure if this is a add-on or theme or both. Basically I like the way this site has their selections 4 a cross and like 8 rows down. How can i do this as well? I sell paintings the my buddy makes and I think layout allows clients to view the product very well without having to click to enlarge.

Next is when you do click one of their images, your taken to a page where you can view additional images o0r checkout. Is this all includes in wordpress of does all of this have to be coded from the ground up?

Again, I apologize for my newbish style question but I’ve never dealt with wordpress and after hearing soo many good things about it, I’m trying to get my feet wet. Thanks for any info. you can provide.