Unfortunately it is very difficult to exchange primecoin sometimes...
Most of exchangers don't support it, those few that support it sometimes may have weeks of very low activity for this coin.
there is such a coin - scudo maltese. Most of exchangers don't support it, those few that support it sometimes may have weeks of very low activity for this coin.
is about the same as primecoin. 
you need to rename primecoin to eXtremalikcoin. so as not to mislead anyone.