Do remember forms of DNA assembly in cell
At Interphase (G1) : Chromatin : Single uncoiled strands of DNA
At Interphase (S ): DNA replicates , Chromatin becomes two strands now called as two chromatids held at one point called centromere
Prophase onwards: Two Chromatids with centromere condense and give it an appearance of chromosome.
This all is chromosome multiplication. According to me the right word should be chromatin multiplication beacuse chromosomes are condensed multiplied chromatin found in the dividing cells.