The number 2 represents the point in the cell cycle during which the chromosomes get replicated. Mitosis is a part of the overall cell cycle in biology in which chromosomes that get replicated divided themselves into two daughter nuclei which then continue to grow as two independent cells.
This is how cell division and cell growth occurs in living organisms. There are many different stages of mitosis. These stages are named as prophase, prometaphase, metaphase, anaphase, and telophase. These stages occur in the order in which they are written. The result of the end stage of mitosis is two genetically identical daughter nuclei.