Answer:
Prime numbers are numbers that have only 2 factors: 1 and themselves. For example, the first 5 prime numbers are 2, 3, 5, 7, and 11. By contrast, numbers with more than 2 factors are called composite numbers.
A prime number cannot be divided by any other numbers without leaving a remainder. An example of a prime number is 13. | 15 is not an example of a prime number because it can be divided by 5 and 3 as well as by itself and 1.
To work out if a number is prime, you can try to divide the number by all numbers that are smaller than it. If it can only be evenly divided by 1 and the number itself, then it is a prime number.
