Q. Is it correct that at the s phase, the chromosome number of the cell is 4 n?
S-phase: During this phase, replication of DNA takes place. Each chromosome contains two sister chromatids, that are attached to a common centromere. At this stage the cell is 4n (4 copies of each DNA molecule, 2 in each homologous chromosome).

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Please find below the solution to the asked query    
Yes, at S-phase the cell is 4n i.e. it has 4 sets of chromosomes in the cell. 

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