Check the system's architecture 32/64 If you're ever unsure either a system you're logged in is 32 or 64 bit the first thing you could do to find out is:
uname -a
Result for a 32-bit system :
Linux XXX 2.6.38-8-generic ... i686 i686 i386 GNU/Linux
whereas a 64-bit system will show:
Linux XXX 2.6.38-8-generic ... x86_64 x86_64 x86_64 GNU/Linux
The x86_64
at the end before the GNU/Linux means that the system is running a 64 bit arch
There are many ways but this is the quickest