It's six.   It has 6 faces, 12 edges and 8 vertices 6 faces   8 vertices   12 edges A rectangular prism has six faces. Imagine  the prism (a standard box, of any dimensions) sitting in front of  you. The box has: a TOP face, a BOTTOM face, a face on the LEFT, a  face on the RIGHT, a FRONT face, and a REAR face.