Can I update a processor?

Just wondering if it’s even possible to update a Pentium processor in an older HP Vectra PC. It’s a Pentium II and only 350 Mhz.

I would love to be able to change it up to something faster but have never done anything specifically with processors.

Is it possible?
And how would I go about it?

Tink

P.S. it has 128k RAM and Windows 98 SE