Yes Capital One Money Market Accounts are FDIC Insured bank accounts.
So your money is protected when you have the money in a Capital One or other money market account and is insured with the FDIC.
So if something happens and you lose your money due to a possible bank failure then your money will be insured and returned to you by the FDIC.
But only up to a certain amount.
When the FDIC insures money in bank accounts they only insure up to $250,000.00 per bank depositor so if you have more than $250,000.00 in one bank account then it won't be insured by the FDIC.
But the $250,000.00 of your money would be insured by the FDIC.