i need to update my mac to mac os version 10.15 is this possible on my model A1398?

There's more than 20 different MacBook Pro models that use same identifier as you stated.

Lookup Mac Specs @ EveryMac.com

This could better help identify your Mac given specific model, order, EMC, model ID #s.

• How to get old versions of macOS - Apple Support

https://support.apple.com/en-us/HT211683

See details on models that could be upgraded from lower versions, to newer ones.

Yes. See here: link-> How to get old versions of macOS - Apple Support