Hired as part time job as front end assistant questions?

Is Costco hiring seasonal workers right now? I applied for part time and in the interview they said I would be seasonal which shocked me because I thought seasonal meant more towards the holidays. If that’s the case how likely am I to be offered to work at Costco as a permanent employee? Also, how often are there full time openings too? I would like to get in as full time eventually. I already have a full time job and would be quitting it to work at Costco. I just don’t wanna be scrapping by if I don’t get enough hours at Costco being part time. I would be working as a front end assistant and would also be looking into helping out other departments. I’m scared that I would be leaving a full time job to a seasonal job where I might not be able to become a permanent employee. I would loose my seniority at the other work place. Side note I wouldn’t be able to work part time at the other job as Costco is considered a competitor.