KBC 2023| The square of which of the following is not a three-digit number? KBC 2023, Check the answer to the question- The square of which of the following is not a three-digit number? By Himani Budakoti - November 1, 2023 KBC 2023, The options of the question – The square of which of the following is not a three-digit number? A. 30 B. 20 C. 9 D. 15 The answer is C. 9.