Based on common naming conventions in digital systems, this file is a container. The "1080" almost certainly indicates that the video is recorded in 1080p Full HD resolution (
Decoding the Digital "898.1080.mp4": A Guide to Understanding High-Definition MP4 Filenames 898.1080.mp4
The safest option for opening unfamiliar media files, as it supports most codecs. Based on common naming conventions in digital systems,