Of course it is! Whatever are yout thinking of? Let's say I ask (pray) you to pray for me, is that not intercessory prayer?
Am I not supposed to let you know that I'd like you to pray for me?
Yes it is...But when Catholics do not ask Mary or the Saints to pray for them but instead pray to them to ask them to provide grace, salvation, lost keys and the myriad of other things that these former live in the flesh people are attributed to have power over, it is not intercessory prayer...
As near as I can tell, a pray thee or a pray you is a request, but a pray to is worship...