If you must open it, look at the file extensions inside. Be wary of .exe , .bat , or .js files hidden within the archive, as these can execute code on your computer.
Because "53602.rar" is not a recognized standard file, you should treat it with a healthy dose of skepticism if you found it unexpectedly on your system or in an email. 53602.rar
Many server systems and database tools generate archives using timestamps or sequential ID numbers. A file named "53602" could simply be the 53,602nd backup generated by a specific script. If you must open it, look at the file extensions inside