Aren't 'vector images' bumpmaps
No, they aren't. I think what you are thinking of are 'normal maps'.
'Vector images' are made of lines and curves.
'Raster images' are made of points.
Vector images are made up of functions, not pixels. A vector image is like a painting, there are no pixels, it's all smooth curves and lines. A bitmap is a raster image, it's just a bunch of dots called pixels.
All images are displayed as raster images, because monitors are raster. That's what the 1024x768 is all about - defining how many pixels wide and tall the screen is.