Congrats, you just received 20 mBTC to your new BitWrk account!

Yes, that's your account ID. It doesn't only look like a Bitcoin address, it is one. BitWrk took a lot of inspiration from Bitcoin technology. If you want to, you can also import that key into your wallet: the WIF file is in /.bitwrk-client/privatekey.wif

Apart from that, there is no real need to worry about the Account ID. I recommend following the quickstart instructions!