Did you boil the sugar in a pint of water and cool it before you added it? Sugar goes into solution much better in a hot liquid than a cold one.
You should boil the sugar in water, dump it in your bottling bucket, and rack the beer on top of it. That should get it good and mixed as the beer swirls around.
On the subject of whether your sugar is already fermented. The quick answer is no, it is not. It takes 2 weeks or more for the yeast to consume the sugar and carb up the bottles. In 1 hour they arent doing much. Remember that the yeast have finished their primary jobs and as a whole they are quite weak. They will ferment the priming sugar but much, much slower than the original fermentation.
I hope that helps.