That number is the Coast Guard Doc #. On the net you can find only limited info here:
http://www.st.nmfs.noaa.gov/st1/Coas...esselByID.html
More info may be discovered by ordering an Abstract Of Title (for $25) from the Coast Guard here:
https://vcart.velocitypayment.com/uscg/
The Chris Craft Hull ID should be on the boat somewhere. If you find it, you can get more info on your boat here:
http://www.mariner.org/