Some effects you can zoom in and see the pixels, but not all effects. This is because Illustrator is limited to zooming in at 6400% and you can render some raster effects to a high resolution that you may not see the pixels. This is why some people think drop shadows and blurs are vector.
However a sure way to find out whether your effect/filter is vector is to expand the object (Object > Expand/Expand Appearance). Keep on doing this until you get to a group or a gradient mesh.
Gradients will convert to a gradient mesh - which is a vector element. An object which has had a raster effect applied to it will have an addition element applied to the group (usually in a clipping mask). The path usually ends up being converted into a path and an image. The object entitled image is a raster object.
If you see the image object in your work, it's not 100% vector and therefore doesn't sadly belong in the vector galleries