Linux Kernel Question

My Red Hat kernel is 2.6.18-164.6.1.el5

How do i know what Linux kernel this is?  is it 2.6 as the main version?
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uname -a

will show you what kernel you are running (has status of kernels)

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And to answer your question, yes.
2.6 is major release and 18 is minor release version
You are running kernel 2.6, minor version 18, with redhat's customizations.  It is redhat package number 164.6.1 for el5 (enterprise linux 5).
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