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Yes, it is possible to check if a dart/flutter package has been installed using the following command in the terminal:

flutter pub outdated

This command will list all the packages that are outdated or have newer versions available, including the ones that have not been installed. If a package is not listed, it means it has not been installed.

Alternatively, you can check if the package is included in your pubspec.yaml file. If it is listed, then it has been installed.