Yes, you can trademark a number.
So long as you use the number as a brand for your products or services, you may be able to obtain a trademark registration for the number. For example, the number “13” is currently trademarked for a line of stapling machines. That is, the owner of the trademark uses the number “13” to brand all of their stapling machines, just like Nike uses the term “Nike” to brand their shoes and clothing items.
If you’re interested in learning more about how to trademark a number, contact us today to speak with a trademark attorney.