first, flutter`s version is 1.0,
second, is this a sdk of dart?
>Solution :
Version is your app version, for example if user went to mobile setting they would see 1.0.0 in front of your app name.
Sdk is you refer to your dart sdk. for example if you are using a package, you can only use the one that have dart sdk between those number in screen shot.
If you want to see your flutter version run flutter doctor and you will see something like this:
[✓] Flutter (Channel stable, 3.0.4, on macOS 12.4 21F79 darwin-x64, locale en-US)
[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
[✓] Xcode - develop for iOS and macOS (Xcode 13.4.1)
[✓] Chrome - develop for the web
[✓] Android Studio (version 2021.2)
[✓] VS Code (version 1.71.0)
[✓] Connected device (3 available)
[✓] HTTP Host Availability
at first line you can find your flutter version, for example mine is channel stable, 3.0.4.