Mini iPad IOS 9.3.5

No, it's not.

Even though I'm sure another member will post a long response to your question, all you really need to know is your device is too old and under powered to run the required 64 bit software. It lacks the RAM required. It is a no longer supported device. I'm sure you are discovering many apps you'd like to run won't run on such an old device.

You'll need a newer device at this point.

Your very old first generation iPad mini can only be updated to iOS 9.3.5 (WiFi Only models) or iOS 9.3.6 (WiFi & Cellular models).

Apple formally ended update support for iPad mini in September 2016. Your iPad mini cannot be updated to iOS 10 or later major versions of iOS, as the internal hardware does not meet the minimum technical requirements for new versions of iOS/iPadOS. This limitation cannot be bypassed - in addition to which, iPad mini is a 32-bit architecture device, whilst all recent versions of iOS/iPadOS are designed for 64-bit hardware platforms.

You may wish to consider that compatible Apps for your iPad are increasingly difficult to find - as third-party developers are increasingly dropping support for older versions of iOS preceding iOS11/12. As older versions of Apps are removed from the Apple App Store, you’ll not be able to (re)download or install them. As such, if you want or need to access most current Apps, requiring more recent versions of iOS, you’ll need to consider replacement of your iPad with a newer or current model.

Even the most basic current iPad7 will massively outperform you current iPad - and is compatible with the vast majority of current Apps.

I hope this information provides helpful clarity as to your available options - and the limitations of your current iPad mini.