Answer :

2100|2
1050|2
  525|3
  175|5
    35|5
     7|7
     1|

2100 = 2 × 2 × 3 × 5 × 5 × 7 = 2² × 3 × 5² × 7
2 squared multiplied by 3 multiplied  by 5 squared multiplied by 7

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