As far as I know, Master account numbers only work on the MultiTerminal and never on the "Single" Terminal version of MetaTrader. Hence, you will never be able to check for that on either system because:
PS! Please note, that my experience with the use of MultiTerminal and MAM accounts is limited and I could be wrong. A second opinion might be wise!
EDIT! Just did some research and it seems that certain MAM accounts, do use an equivalent standard MT4 with full charts and EA's . However, I cannot find any documentation about how to different the account types.