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Q: Which of the following numbers is a prime number?
  • A. 121
  • B. 141
  • C. 181
  • D. 161
Correct Answer: Option C - Prime numbers are divisible by 1 and itself only. Example:- 5,11,13,19 From options, Factors of the numbers, 181 = 1, 181 121 = 1, 11, 121 141 = 1, 3, 47, 141 161 = 1, 7, 23, 161 Hence from the above it is clear that '181' is a prime number.
C. Prime numbers are divisible by 1 and itself only. Example:- 5,11,13,19 From options, Factors of the numbers, 181 = 1, 181 121 = 1, 11, 121 141 = 1, 3, 47, 141 161 = 1, 7, 23, 161 Hence from the above it is clear that '181' is a prime number.

Explanations:

Prime numbers are divisible by 1 and itself only. Example:- 5,11,13,19 From options, Factors of the numbers, 181 = 1, 181 121 = 1, 11, 121 141 = 1, 3, 47, 141 161 = 1, 7, 23, 161 Hence from the above it is clear that '181' is a prime number.