19 is a Prime number. Its only factors are 1 and 19.
21 is a composite number. Its factors are 1, 3, 7, and 21.
23 is a prime number. Its only factors are 1 and 23.
19 and 23 are prime numbers whereas 21 is a composite number
21 is composite. 19 and 23 are prime.
No, they are three numbers, not one. 21 is composite.
17, 19, 23, 29 and 31 are prime. 15, 21, 25 and 27 are composite..
19 and 23 are prime.
21, 55, 77, and 93 are composite numbers. 23 is a prime.
21 is composite. 19 and 23 are prime.
No, they are three numbers, not one. 21 is composite.
17, 19, 23, 29 and 31 are prime. 15, 21, 25 and 27 are composite..
21 is composite.
All the numbers are composite except the ones in bold: 18 19 20 21 22 23 24 25.
15 is composite number 17, 19 and 23 are prime numbers.
19 and 23 are prime.
21, 55, 77, and 93 are composite numbers. 23 is a prime.
They are all prime numbers except for 15 21 25 and 27 which are composite numbers
23 is prime. 21 is composite as it is 7x3. A prime number has only 2 factors which are 1 and itself. Composite numbers are every other positive integer except 1 and 0. 1 and 0 are neither prime, nor composite.
23 is prime, 66 is composite.
23 is a prime number. It is only evenly divisible by itself and one.The factors of 62 are: 1, 2, 31, and 62.The prime factors of 62 are: 2 and 31.