A number may be made by multiplying two or more other numbers together. The
numbers that are multiplied together are called factors of the final number. All
numbers have a factor of one since one multiplied by any number equals that number.
All numbers can be divided by themselves to produce the number one. Therefore, we normally
ignore one and the number itself as useful factors.
A Prime number has only itelf and one as factors. A composite number has factors
other than 1 and itself.
The prime numbers between 2 and 100 are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29,
31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89 and 97. All of the other
numbers betwen 4 and 100 are composite.