To determine the version of SQL Server, you can use any of the Step 2 or Step 3:-
Step1:- Open an Sql instance and connect
step2:- Execute an query Select @@version debug and run
step3:- To know about Productversion, Product level and edition execute this below Query.
SELECT SERVERPROPERTY('productversion'), SERVERPROPERTY ('productlevel'), SERVERPROPERTY ('edition')