How to change this on server

I have dedicated server and when page appear with info saying Apache/1.3.27 Server at yyy.xx*********** Port 80

this yyy.xxx*********** is not my hostname or my domain but my server provider. I did input my hostname but this is not it.

How to change this kidn of appearance. Server is with Cpanel/WHM

Thanks

 

 

 

 

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