No. Kakashi is not, nor has ever been, an Uchiha. The way he gets is explained in the manga, but the corresponding episode hasn't even aired in Japan yet. You're going to have to wait, and think of the possiblites on your own.
Kakashi is not any part of the Uchia Clan,the sharingan was given to him ,but I guess I cant go on.I came in and edited this.Sorry those who may have read it got a little spoiler. I apologize. (He belongs to me!!!)