Forum Moderators: mack
All servers automatically record requests for pages. That data is stored in log files. You may or may not have access to your raw log files (your webhost can tell you), but even if you do, raw log files are cumbersome to sort through, which is why you want to find the site stats.
If you want to know when the last time Google crawled was, you can search for your site address in Google, and then look at the date for Google's cache.