Want to move the router

It will become clear that I am pretty clueless. The router is located in the basement; I want to move it to the first floor so all the rooms get wifi. On the first floor, the cable wire comes out of the wall into a cable tv box. The box goes to the tv via html cable. On the back of the cable box is an OUT; can I hook up the OUT to an In on the router?
Thank you for any advice/help.