I would explore whether LG is trying to send you a software update, but NOT by clicking this icon. Go to settings-about phone-system updates and see if there is anything legit they want to update.
While many carrier and manufacturer apps cannot be uninstalled from a phone, you should be able to remove any icon from a home screen even though the actual app remains installed. An icon that cannot be removed from a home screen is suspicious. Have you searched the app drawer for any app that might be related to this icon? If so, can that be removed? I'd recommend you download Avast or Lookout from the Google Play store and do a scan.