How to display images in original size in Unity?

Question

Unity

Is it possible in Unity 2D to get sprites to be displayed in real sizes? That is, if I upload an image of 256x256px, then it should be displayed in this size at any screen resolution and Viewport size. For example, when filling in, on a large screen, these images should turn out to be many, and on small ones, accordingly, few. How can this be configured in Unity?