Q: How many finger prints can be stored for use on the iPhone 6 plus and iPad air 2?

You can have more than 1. I currently have 3 on mine. See this support document for using Touch ID. Using Touch ID on iPhone

You're welcome. Enjoy your phones.

Flexter wrote:

 

my wife and I share the iPhone 6 plus can we both enter a finger print for access and payments On one device?

On an iPhone, you can have 5.