You should really check the gravity 2-3 days in a row to determine if fermentation is finished. If it does not change then you are good to go for bottling.
If you add table/simple sugar you may get a cidery note to the beer. Of course it all depends on the concentration of sugar and all but you can definitely dry out your beer with sugar.
If you add sugar though be sure to wait until the gravity is stable otherwise you could end up with bottle bombs!! That would not be good!
Depending on the temperature of the beer now you may want to warm it up to around 70-72 to maybe "kickstart" your yeast. If the yeasts are cold they tend to be very slow at their job, warming them up may help them finish faster!
Just a thought!
“I don't drink beer all the time but I can drink (a) beer anytime" - Me