Grandma's P2PKH Key

I need help. I got what I think is a P2PKH key from my grandma who passed away. I don’t know if it’s a private key or public key. For security purposes, I don’t want to enter the key into any search engines or online support. So my question is this, is there an Umbrel app that can help me figure out what this address is? Can I use it to check the ledger some how?

(Dude, this was so hard to write without sounding like a scammer.)

If anyone can help me, I would really appreciate it. My family would be excited if I can use my own node to verify this.

Thank you!

I’m giving RPC Explorer a shot. I type the address in and it comes back with zero transactions. :frowning:

I think this is the app I am looking for. Thank you!