Usually you can find the information on the spool label. It will say something like 50/3 or 60/2. The first number is the weight of the thread and the second number is the number of plys to the thread.
I have never had very good luck with Coats all purpose for hand sewing. I would say to run it thru beeswax and then iron over it to melt the wax into the thread. That may help with the fraying. I use one of the little Clover craft irons for ironing my thread. I use the beeswax on almost any thread if I am hand sewing.