If you have the image, using Google Images with that filename might trace it back to the original hosting site.
Disclaimer: As this is a generic numerical ID, it may not point to a single public internet file without the specific website context. Download 1604284943 Join png
A "Join png" typically refers to a transparent PNG image illustrating a concept of connecting, joining, signing up, or collaborating. Common visual representations include puzzle pieces coming together, linked chains, or joining hands. If you have the image, using Google Images