DCFO, £100. 1st hand of level 1. Everyone has 4k chips. No real reads on opponents, seem fairly straightforward.
3 limpers (from middle position onwards) you raise to 275 with

on button. Blinds 25/50
2 callers.
Flop

Both check to you, you bet 500.
Mp1 folds
Mp2 all-in. Hero?
Is this always a snap call?