Mathematics for IGCSE & O level - Number (Section 1 - No. 25)
Which statement about prime numbers is correct?
Every even number greater than 2 is prime.
All prime numbers are odd.
There are infinitely many prime numbers.
The sum of two prime numbers is always prime.
Giải thích
The definition of a prime number states that it has exactly two factors, 1 and itself. There are infinitely many prime numbers.