What's the difference between the number of chromosomes in 2 new nuclei than of the orignal parent nucleus?

What type of cell division?  If the parent cell divided by mitosis, the number of chromosomes in the daughter cells would be exactly the same as that in the parent cell.  If this was a meiotic division (to produce pollen and ovules), it would have 1/2 of the chromosomes of the parent cell by the final division.

Cell division is of two types---mitosis and meiosis. During mitosis the 2 new nuclei in the daughter cells have the same number of chromosomes as the parent/mother cell, for example, a human cell with 46 chromosomes undergoing mitosis would give rise to 2 daughter cells with 46 chromosomes each. Now during meiosis (also known as reduction division) each cell divides into four daughter cells each with half the number of chromosomes as the parent cell, for example, each germ cell in humans start with 46 chromosomes and after meiosis it gives rise to 4 cells with 23 chromosomes each.

There is absolutely no difference in the number of chromosomes in two nuclei formed from the parent nucleus after the mitotic division. Mitosis never divides the number of chromosomes but it restores the original number of chromosomes. However when it is meiotic division  (Meiosis = reduction division)  then the total cells that are formed are 4 and each carries half the number of chromosomes than the parent cell. This division takes place in sexual reproduction during gamete formation.