port number of SQL Server
In SQL Server - What ports need to be opened on the firewall to get access
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Since you didn't specify much information, I'll go with the half-a-second Google route:
By default, TCP port 1433 is used.
I think by default the SQL server instances run on port number 1433. But I think it can be configured to run on other ports too.
You can find on which port your sql instance is running by following this -
Using the GUI: In SQL Server 2005, you can use the SQL Server Configuration Manager. Look under SQL Server 2005 Network Configuration and look at the TCP port for the TCP/IP protocol.