If it's a rabbit you purchased, unless the seller specifically advertised it as 'show quality' it's probably not (and even then, sometimes not). If it's one you bred it can be a bit harder to tell, as it's notoriously difficult to determine the quality of young rabbits. If you're new to rabbits the easiest way to tell is to take the rabbit to the show, and enter it. The entry fees are usually less than $5 and the judges can tell you exactly why the rabbit is or isn't show quality. If there isn't a show around you, you can try to find a breeder near you and ask them. If you can't find anybody to help you (hands on is really the best way to learn), you can purchase a Standard of Perfection from arba.net
This lists the general disqualifications, breed disqualifications and faults so you can try to compare your rabbit to it and see if it has anything that would prevent it from showing.