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People's Education Press Primary School Mathematics Grade Five Volume Four Exercise Page 13 Question 8
Can be filled! The smallest cuboid has 3, 3 and 6 sides, and the volume is 54, which can accommodate 3, 3 and 3 cubes.

Similarly, we can know: (3, 6, 6) (3, 9, 9) (3, 3, 9) (3, 6, 9) (30, 3, 3) (369, 693, 309) ... and so on.

In short, all three sides of a cuboid are integer multiples of 3, and a cube with a side length of 3 cm can always hold these complete cuboids!