Type it in console:

cat /proc/version

Linux version 2.6.18-92.el5
(brewbuilder@ls20-bc2-13.build.redhat.com)
(gcc version 4.1.2 20071124 (Red Hat 4.1.2-41))
#1 SMP Tue Apr 29 13:16:15 EDT 2008

In this output, you get to see the following information:

1. Exact version of the Linux kernel used in your OS: Linux version 2.6.18-92.el5
2. Name of the user who compiled your kernel, and also a host name where it happened: brewbuilder@ls20-bc2-13.build.redhat.com
3. Version of the GCC compiler used for building the kernel: gcc version 4.1.2 20071124
4. Type of the kernel – SMP here means Symmetric MultiProcessing kernel, the one that supports systems with multiple CPUs or multiple cpu cores
5. Date and time when the kernel was built: Tue Apr 29 13:16:15 EDT 2008

For more: http://www.unixtutorial.org/2009/04/use-proc-version-to-identify-your-linux-release/

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