在自然数的家族里,发生了一场前所未有的战争,这场战争是由数字1引起的,就是因为数字1看着别人成双成对,心里嫉妒。数字1倡议:一个数,如果只有1和它本身两个因数,这样的数叫作质数。如2、3、5、7都是质数,这便是质数集团。一个数,如果除了1和它本身还有别的因数,这样的数叫作合数,组成了合数公司。没多久,战争便开始了。先有了乘法大战;质数×合数=合数,合数×合数=合 In the family of natural numbers, an unprecedented war took place. The war was caused by the number one, because the number one looked jealous of others in pairs. The number 1 initiative: a number, if there is only 1 and itself two factors, such numbers are called prime numbers. Such as 2,3,5,7 are prime numbers, this is the prime number group. A number, if there is a factor other than 1 and itself, is called a composite number. Before long, the war started. Multiply warfare first; prime × composite number = composite number, composite number × composite = composite