Contact Verizon Wireless Customer Service and ask them if the telephone number in question is available.
You could also try calling the number to see what happens.
I tried calling customer service and was told you couldn't pick the last four digits of your number. Their web site is the same way, what crap. It should display a list of available numbers and let you select any available number.
It may be a lost cause.
If my memory is correct, when I went to purchase my cellular phone from Verizon Wireless a long time ago, I requested a telephone number that is associated with the name of the town that I live in. I was unable to request a specific telephone number....just a number associated with a specific Rate Center.