A rectangular prism has a length of 4 1/2 millimeters, a width of 4 1/2 millimeters, and a height of 6 millimeters.

Sally has a storage container for the prism that has a volume of 1 4/3 cubic millimeters.

What is the difference between the volume of the prism and the volume of the storage container?

Enter your answer in the box as a simplified mixed number or a decimal.