IOS 113

That model number corresponds to a 16 GBs, WiFi ONLY iPad 3rd generation ( iPad 3 ).

That iPad model is too old to run any newer versions of iOS and is at its final iOS version of iOS 9.3.5.

Tap on my link below to read my further explanations.

iOS 10/11/12 and iPad 2, 3 & 1st generation iPad Mini Compatibility

9.3.5 is the highest iOS version it supports

The current version is iOS 12.0.1, but whether you can update your iPad any higher than 9.3.5 will depend upon the model : Identify your iPad model - Apple Support

An iPad 2 and 3 only support up to iOS 9.3.5, as does the first Mini.