The GolfQuis club number is a unique number you get from your club or organization.
The club number makes it easy to find golfers from your club. You can then add the person as a GolfQuis friend or invite him or her to a match game. It also enables you to participate in club tournaments, and you can see your club on the ranking page so that you can compare yourself with other members of the club or see how your club is doing versus other clubs.
If your club does not have a GolfQuis number, please inform them about the option; it is free for clubs to register. They can read more here