Reb E,
I am guessing you haven’t been learning daf yomi.
As Beneepraom noted it’s a korbon that was brought so the pesach can been eaten “al hasova”
There is a machlokes of all the Halachos of the korbon pesach apply to it. But it is not docha shabbos as is the pesach itself.
Benephraim, it is a zecher. It’s not the korbon itself. Where do you find that you get rid of a zecher on shabbos.