prime numbers: numbers whose only factors are 1 and itself
2,3,5,7,11,13,17,19,23
composite numbers: numbers with more than two factors
4,6,8,9,10,12,14,15,16
square numbers: numbers that are the result of squaring a number
eg: 1 is sqrt of 1, 4 is sqrt of 2, 9 is sqrt of 3
cube numbers: same as square numbers but cubed
1, 8, 27, 64, 125