theres only one even Prime number, thats 2
prime numbers can only be divided by themselves, and 1
21, divisible by 3 or 7, so no
28 even number other than 2, so no
15, divisible by 3 or 5, so no
17 divisible only by itself and 1, so yes
28, even number, other than 2, so no
The prime numbers between 10 and 21 are 11, 13, 17, and 19.
Four. The prime numbers between 10 and 21 are 11, 13, 17, and 19.
17, 19, 23, 29 and 31 are prime. 15, 21, 25 and 27 are composite..
3, 13, 17, 23 are prime numbers. The others are not.
ANSWER: 9, 15, 21 are not prime numbers because these numbers have factors other than 1 and themselves. Therefore, 9, 15, 21 are composite numbersFactors of 9 other 1 and itself (9) : 3Factors of 15 other 1 and itself (15): 3, 5Factors of 21 other 1 and itself (21): 3, 7
They are all prime numbers except for 15 21 25 and 27 which are composite numbers
17 is a prime number, but 21 is not (21 = 3 * 7).
The prime numbers between 10 and 21 are 11, 13, 17, and 19.
Yes.
Four. The prime numbers between 10 and 21 are 11, 13, 17, and 19.
The prime numbers from 1 to 21 are 2, 3, 5, 7, 11, 13, 17, and 19.
13 is prime so it is not the number. 15 is the product of 3 and 5, two prime numbers, so it fits the conditions. 17 is prime so it is not the number. 19 is prime so it is not the number. 15 is the only odd number between 11 and 21 that fits the conditions. However, if 21 is included in the range, it also is the product of two prime numbers: 3 x 7.
The prime numbers between 2 and 21 are: 2, 3, 5, 7, 11, 13, 17 and 19
17, 19, 23, 29 and 31 are prime. 15, 21, 25 and 27 are composite..
9, 15, 21, 25 and 27 aren't .. because they have more than two divisors.
3, 13, 17, 23 are prime numbers. The others are not.
ANSWER: 9, 15, 21 are not prime numbers because these numbers have factors other than 1 and themselves. Therefore, 9, 15, 21 are composite numbersFactors of 9 other 1 and itself (9) : 3Factors of 15 other 1 and itself (15): 3, 5Factors of 21 other 1 and itself (21): 3, 7