The simple rule here is: use the device you saw/wanted, and chop of the digit.
So, instead of
That's the raw (whole) device, the numbers you see are the numbers
of the respective partitions.
I added that -l as a "safety measure". While you can obviously
use fdisk and then interactively display the information you're
after, it's safer to use the -l switch, which makes fdisk output
the partition table and some other information, and quit. No risk
of accidentally re-writing (destroying?) your partitioning.