Even if it doesn't ask on their application, they probably know. Or if they don't know, you should tell them. It's all part of your 'history' and its nothing to be ashamed of. Whether you didn't apply early enough, to a broad range, or maybe your improved your MCAT score or picked up some awesome EC's, there's reasons you didn't get in but also you need to show them improvements you made to your application and experience in the year between. If you graduated 1.5 years before your interview with them and all your credentials show you want to go to med school, they probably will assume you're a re-app and it seems harmful to your chances to try to 'dance around' the issue to try to avoid telling them.
Many schools actually prefer re-applicants (over a new applicant of similar stats) because it shows that you have a drive because you know this is absolutely what you want to pursue. It also shows that you can push through tough outcomes and come back stronger the next time.
I am a re-applicant and applied to some new schools this year (as I did not apply broadly enough last year), and I do not believe I was asked on my primary/secondary if I was a re-applicant but the year off and it's effects on me we're an integral part of my PS so all of them knew right away. Also, I got accepted to a school I didn't apply to the first time.
Hope this helps,