What is this QR code like thing?
This is a "Datamatrix" barcode, not QR. You may have to go in to your barcode scanner's settings to enable datamatrix scanning.

"45506501001855200841661E" is what is encoded.

If you want to read more, you can see it here:
https://en.wikipedia.org/wiki/Data_Matrix

There are two good reasons to use Datamatrix: good data density (more characters per sq mm) and the patent is expired.