Which one of the following is not a prime number?

Maths / Basic Math — Multiple-choice practice

  1. A. 91
  2. B. 31
  3. C. 71
  4. D. 61

Correct answer

91

Explanation

Explanation 91 is not a prime number because it is divisible by 7 and 13 (91 = 7 × 13). A prime number is a natural number greater than 1 that is not a product of two smaller natural numbers.

Continue with Basic Math MCQs, explore all Maths topics, or try the Basic Math practice quiz.

More Basic Math questions

Found an error? Report a correction with this page URL and a supporting source.