In my area, channel 1538 is BeIN Sport en Espanol HD and is shown in the channel lineup as included in the La Conexion channel package. Channel 598 is BeIN Sport HD and must be purchased separately with the Sports Pass package for an extra $10 per month. These are HD channels, so you must have an HD STB to view them.
You can see what is included in the La Conexion package in your area by going here. If you are signed in, it should take you right to the listings page. If you are not then you will have to enter your zip code and county.
Hope this helps.