If you look in the raw data of the transaction on the blockchain you can see if it is a "prime" and which one it is.
http://s4.postimg.org/mwslc9b7x/raw_data.png**EDIT** Guess GAW didn't know that the blockchain required every bit of raw data to be public... or maybe they did and just didn't care...
There you go, vancefox setting the record straight as usual. Thank you sir (or madam, can't be too certain these days).