Because 3713077348920.mp4 appears to be an auto-generated filename, its specific "usefulness" depends on its origin:
If you are referring to the legal concept of a in relation to copyright law (often discussed in digital media contexts), Understanding the Useful Article Doctrine 3713077348920.mp4
: Often, these strings are identifiers for specific memes or trending clips found on social databases. Because 3713077348920
: The functional shape of the article itself—such as the structural design of a chair or an automobile—is generally excluded from copyright protection. Content of the Video File 3713077348920.mp4
: Artistic elements of a useful article (like a graphic design on a piece of clothing) are only copyrightable if they can be identified separately from the object's functional aspects.