KBC 2023| 18 is not fully divisible by which of these numbers? KBC 2023, Check the answer to the question- 18 is not fully divisible by which of these numbers? By Himani Budakoti - September 11, 2023 KBC 2023, Amitabh Bachchan. (Representative Image) KBC 2023, The options of the question – 18 is not fully divisible by which of these numbers? A. 2 B. 3 C. 4 D. 6 The answer is C. 4.