Is there a way to tell if an Intel CPU can do 64-bit or not?

Hi.

I have a few years old Pentium 4 machine, but I don't know if it can do 
64-bit. Is there a way to check without installing and running the 
installed OS? Can I use a LiveCD (which one?), look in BIOS/CMOS 
(didn't see anything to mention it), etc.?

Thank you in advance. :)
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back then. We had crab grass. I remember one green where I putted 
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