The version information of SQL server you are running can be returned using below query:
SELECT @@VERSION
If the version returned contained x86 that means it is a 32 bit installation and if it contains x64 then it means it is a 64 bit installation.
SELECT @@VERSION
If the version returned contained x86 that means it is a 32 bit installation and if it contains x64 then it means it is a 64 bit installation.
