No, mHz is millihertz. MHz is megahertz. NIST Special Publication 811. Live it, learn it, love it. https://www.nist.gov/physical-measurement-laboratory/special-publication-811 Specifically for this problem, Chapter 4.3 and Table 5.
Yes, exactly! That's a beautiful document. Very soothing to read, makes the think the world is rational. Yours in metrology