While it imports as a single prefab, that prefab will be composed of pieces that you can then use. For example, I would guess there is a mesh for each domino piece (28 in total for 6-pip dominoes), or 7 for each half-domino numbered blank to 6.
If it is not like this, send it back to TurboSquid and tell them it’s not good enough for your use. Then spend 10 minutes and make it yourself in whatever form you need.