Upgrade Mac OS from El Capitan to Sierra
Apple has machine friendly names for Sierra  here. 


https://support.apple.com/en-us/HT208202


Since you didn’t show that, use Everymac's Ultimate Mac Lookup

This is a MacBook "Core 2 Duo" 2.0 13" (Unibody), maximum macOS 10.11.x - so, no, it's been upgraded as far as it will go.