Why SQL Server port number is not default 1433? Installed latest SQL Server. It is listening on port number 62628 according to server log. Why is the port number is not the default of 1433? 

How to change the port number back to the default 1433?

It was installed on Windows 10. The server name is MachineName\SQLEXPRESS. I did not give a name.
Contributed by AlwaysLearning:

Configure the Windows Firewall to Allow SQL Server Access:
By default, named instances (including SQL Server Express) use dynamic ports. That means that every time that the Database Engine starts, it identifies an available port and uses that port number. If the named instance is the only instance of the Database Engine installed, it will probably use TCP port 1433. If other instances of the Database Engine are installed, it will probably use a different TCP port.