Your best bet is to try an online resource like www.whitepages.com/reverse_phone. All you have to do is to enter the phone number in the field provided and click on "search." If not, you can always seek your service provider's assistance or talk to the police.
If they did indeed break into your house, take any and all information you have (including the phone number) to your local police department. They have access to many resources we as everyday citizens don't, and will probably have a much higher chance of finding who the number belongs to.