IF YOU ARE CORRECT I WILL MARK YOU AS BRAINLIEST! Look at the image below.

Answer:
17 cubes
Step-by-step explanation:
first we do the volume of the rectangular prism to get 135/64.then we do the area of the cube to get 1/8 and now to get how many cubes it fills the prism. 135/64 divide by 1/8 you get 16.8 round off you get 17