Aprime number is a number like 7 or 23 or 103, which has exactly two factors, those necessarily being 1 and the number itself.(The word divisor is also used as an alternative word for factor.)We do not count 1 as a prime as it has only one factor. The first prime then is 2, which is the only even prime and the following trio of odd numbers 3,5, and 7 are all prime. Numbers greater than 1that are not prime are called composite as they are composed of smaller numbers. The number 4=2×2=22 is the first composite number;9 is the first odd composite number, and 9=32 is also a square. With the number 6=2×3, we have the first truly composite number in that it is composed of two different factors that are greater than 1 but smaller than the number itself, while8=23 is the first proper cube, which is the word that means that the number is equal to some number raised to the power 3.
相关影视:台球赌钱高清视频