A Prime number has exactly two factors, 1 and the number itself. The factors of 21 are 1, 3, 7, and 21, and the factors of 27 are 1, 3, 9, and 27. Since 21 and 27 have more than 2 factors, they are composite numbers.
They are all prime numbers except for 15 21 25 and 27 which are composite numbers
Both are composite numbers
27 and 55 are composite numbers but 13 is a prime number
29
Neither 27 nor 52 are prime numbers. Both are composite numbers, instead.
3 is prime. Rest are composite.
23 and 27 are prime numbers whereas 36 and 39 are composite numbers.
No, they are both composite.
27 and 18 are both composite numbers. They are multiples of 3.
No, some composite numbers are odd. The smallest composite odd numbers are 9, 15, 21, 25, and 27. Not all even numbers are composite either. There's only one even number that's prime, which is 2.
27 is composite. 27 = 3 * 3 * 3 = 3315 is composite. 15 = 3 * 521 is composite. 21 = 3 * 723 is a prime number. It is only evenly divisible by itself and one.
They are all composite numbers except 43 which is a prime number