The first is by using either Enterprise Manager or SQL Server Management Studio and right clicking on the instance name and selecting Properties. In the general section you will see information such as on the following screenshots. The "Product version" or "Version" gives you a number of the version that is installed.Is there a free version of SQL Server?
SQL Server 2019 Express is a free edition of SQL Server, ideal for development and production for desktop, web, and small server applications. Connect with user groups and data community resources related to SQL Server, Azure Data, and diversity and inclusion.