If they don't call you back that means that your availability doesn't meet the needs of the store. I think there's a disclaimer about that on the site where you fill out the application

If you call, just ask if he's received your application. Don't try to ask what he thinks, etc, the manager should be direct with you about whether you got the job or not.

It's got to do with timing, availability and the amount of applications that the store already has.