When given 36 cubes, list 4 ways rectangular prism can be created with a volume of 36 cubic units?

Let a "layer" or a "floor" be the placement of cubes adjacent to each other, in rectangular shapes.

Each layer has columns and rows.

1. Way: let one layer be  3 columns * 3 rows.
            place 4 of these on top of each other

check the picture, 1 layer has 9 cubes, so 9 cubic units of volume. 4 of these on top of each other, make a prism with 9*4=36 cubes which means 36 cubic units of volume. 

2. Way. Form only one layer, which has 6 colums * 6 rows (per each column)

3.Way. let 1 layer be 2 columns * 3 rows, 
            place 6 such layers on top of each other

4. Way.let one layer be just one cube. Place the 36 cubes on top of each other 

Main idea on left, details on right