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CTET PAPER I 2019 · PYQ · Prime Numbers · easy

Which of the following statements is not correct?

  1. A.All prime numbers are odd numbers.✓ Correct
  2. B.There are infinitely many prime numbers.
  3. C.A prime number has only two factors.
  4. D.There are only four single digit prime numbers.

Explanation

The statement 'All prime numbers are odd numbers' is incorrect because 2 is a prime number and it is even. In fact, 2 is the only even prime number. The other statements are correct: there are infinitely many primes (proved by Euclid), every prime has exactly two factors (1 and itself), and the four single-digit primes are 2, 3, 5, and 7.
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