Newbie: port

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Dear all,
On what port does postgre run?
How do I know if postgre already running on my box?
I nmaped and the result was:
Starting nmap V. 3.00 ( www.insecure.org/nmap/ )
Interesting ports on localhost (127.0.0.1):
(The 1583 ports scanned but not shown below are in state: closed)
Port       State       Service
21/tcp     open        ftp
22/tcp     open        ssh
25/tcp     open        smtp
80/tcp     open        http
110/tcp    open        pop-3
111/tcp    open        sunrpc
139/tcp    open        netbios-ssn
143/tcp    open        imap2
443/tcp    open        https
631/tcp    open        ipp
783/tcp    open        hp-alarm-mgr
993/tcp    open        imaps
2049/tcp   open        nfs
3306/tcp   open        mysql
6000/tcp   open        X11
10000/tcp  open        snet-sensor-mgmt
32770/tcp  open        sometimes-rpc3
32771/tcp  open        sometimes-rpc5
Thanks
- --
Fajar http://linux.arinet.org
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