Whitch is the number 2 cylinder on a 5.4 liter v 8?

On a standard V8 engine, the cylinders are numbered sequentially from one bank to the other. Therefore, cylinder #2 would be the second cylinder on one of the banks (either the left or right depending on the engine's orientation in the vehicle). There's no way to definitively say which side without a diagram specific to that 5.4L V8 engine's model and orientation. You need a diagram or a service manual for your specific vehicle to know for certain.