I am posting this for anybody else who may be as new as I am to this. If it is not a rubber hub, and is the plastic type for the Mercury prop, then this will help. The thrust washer that goes between the prop and the stern drive on the prop shaft will sometimes "stick" to the back of the prop, which does make it seem as if it is part of the prop. You can loosen this by lightly tapping on the sides of the washer. I used a hammer and a steel file and tapped a few times, then turned the prop a little and tapped a few more times, I did this and it was broken loose before I got all the way around with the prop. Then the plastic hub can be tapped lightly from the front of the prop and it will break free also, then once it is cleaned up it can all be installed into the new prop. Here is a link that describes how it can be installed. Hope this can help someone else!
http://www.propline.com/Propeller-General-Information/Propeller_Installation.htm
