9
5 is a prime number.
24 is not a prime number because it has more than two factors.
It's not a case of working them out, you just have to know them. Here are the following prime numbers under 100:
The two prime numbers immediately following 17 are 19 and 23.
Prime numbers are numbers that are divisible by themselves and 1. 1 itself is not regarded as a prime number. With the exception of 2, all prime numbers are odd numbers. Applying this gives the following prime numbers less than 25 :- 2,3,5,7,11,13,17,19 and 23.
2 would be a counterexample to the conjecture that prime numbers are odd. 2 is a prime number but it is the only even prime number.
The two that are relatively prime.
This list of numbers is the list of prime numbers. Following 11, the next two numbers in the list are 13 and 17.
The ratio of composite numbers 6,3,4,12,18 and 17 to prime numbers would be 9,15,21 and 25. This is taught in math.
The number 2 is even as well as prime.
741 results from the following multiplications of two numbers: 1 * 741 (1 is not prime) 3 * 247 (247 is not prime) 13 * 57 (57 is not prime) 19 * 39 (39 is not prime) There are no two prime numbers that when multiplied equal 741. 3 * 13 * 19 equals 741, and all three of those numbers are prime.
Those numbers would have to have following forms of prime factors:a3, where a is any prime number. For example, 23 = 8.ab, where a and b are two different prime numbers. For example, 2 x 3 = 6.