Yes, it is very necessary to learn Dart language for building Flutter application.

Yes, if you want to develop mobile applications using Flutter, learning Dart is highly recommended. Dart is the programming language that Flutter uses for building cross-platform mobile, web, and desktop applications. Flutter itself is a UI toolkit that allows you to create natively compiled applications for mobile, web, and desktop from a single codebase.

While you can use other languages with Flutter, such as Kotlin or Swift for native Android and iOS development, respectively, Dart is the preferred and officially supported language for Flutter development. Learning Dart will enable you to take full advantage of Flutter’s features and capabilities, and it will make your development process smoother and more efficient.

So, in summary, if you’re interested in Flutter development, it’s a good idea to invest time in learning Dart.