No. The domain name for Yahoo actually belongs to the website - and affiliates - of the same name. Yahoo has actually not been available for a large number of years.
The domain name Yahoo is valued at $5890.26. It is possible that this number has changed or is not entirely correct. Yahoo is a very popular website and that is why it has a high value.
First, come up with a domain name that you would like and then type it in. If a website pops up then that domain name has been taken. Then try another one and repeat the process.
There is a website called www.whois.net This webisite will allow you to search for available domain names. You can also find domain keyword search and deleted domains if you wish to do so.
You can purchase a domain name at Godaddy. They are a newer very popular site which searches if the name has already been taken, and for less than $10 you will have your own domain.