Those files are specifically for Unity
Every asset in Unity has a .meta file that it uses to keep track of information about the file
And the .prefab file is a collection of other assets.
So really the only assets you need are the FBX or any texture files.
Make sure though that if you have something you got from the Unity asset store that you check the licensing terms to make sure that the files can be used in that way, it might have something in there that restricts you to using them only with Unity.