How do I stop the object I used as part of a boolean from rendering? I want to add a small cut for my bishop. So I have used boolean difference modifier but when rendering it renders the cube also, but I want to create a notch there. Please tell me how to remove the cube from my piece.
You need to disable the rendering of your object:

in the outliner menu on the right, click on to enable the rendering toggle switch

then just turn it off for your object.