64 bit or 32 bit OS ?

[Yard, John]

Forgive the newbie question :

Is my ES 3 Linux OS a 32 bit or a 64 bit OS  ?

If I do uname -a , I get 

Linux xxxxxx.ucla.edu 2.4.21-27.0.2.ELsmp #1 SMP Wed Jan 12 23:35:44 EST
2005 i686 i686 i386 GNU/Linux

Also , can someone point me to some Linux ES 3 
docs discussing this issue ?

Thx,

JYard
UCLA