Is mowing lawns considered a job?

I am applying for a job at the local krogers online (I'm 14 for the record). on the online application it asks whether or not I have had a part time job in the past 3 years. I have mowed lawns every summer for the past two years. I mowed about two or three a week, is this worth putting down as a part time job, or is the fact that I was self employed without an official business not consider a job?