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What is a prime number?

  1. A number that can only be divided by 1 and itself

  2. A number that can be divided by itself

  3. A number that can only be divided by 1

  4. A number that can be divided by any number

The correct answer is: A number that can only be divided by 1 and itself

A prime number is a positive integer that can only be divided by 1 and itself, making it unable to be factored further. Option B is incorrect because every number is divisible by itself, and option D is incorrect because not every number can be divided by any number. Option C is also incorrect because every number is divisible by 1.