Which of the following is a prime number?

  1. 22
  2. 23
  3. 25
  4. 27
Explanation

Answer: B - 23 is a prime number. A prime number is a number that can only be divided by itself and by the number 1, without a remainder. 22, 25, and 27 can all be divided by numbers other than itself and 1. Even numbers greater than 2 are never prime.

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