Like Brook said often chloramines will register on an ammonia test since chloramine is chlorine and ammonia bonded together...
You can find out test results by looking up your supplier on line...
Prime detoxifies ammonia so an active biological filter can consume it before it harms fish, but you sound to in the 5x usual dose range to start.The ammonia will still show after prime, so until next day it is hard to tell if you have done things properly...