can i stall macOS montrerey on macbook pro mid 2009

No, and in case other people would like to check if their devices are supported, you can find the official list here:

macOS Monterey is compatible with these computers - Apple Support

Sadly, no. The earliest MacBook Pro that can run macOS Monterey is from 2015.

10.11 El Capitan appears to be the last version of macOS for 2009 MacBook Pro.

No.

(220689)

No. No, you can't.