They are: 2, 3, 5, 7,1,13, 17, 19, 23, 29, 3 1, 37, 4/kloc.

2. There are 74 composite numbers within one hundred. They are:

4、6、8、9、 10、 12、 14、 15、 16、 18、20、2 1、22、24、25、26、27、28、30、32、33、34、35、36、38、40、42、44、45、46、48、49、 50、5 1、52、 54、55、56、57、58、60、62、63、64、65、66、68、69、70、72、74、75、76、77、78、80、8 1、82、84、85、86、87、88、90、9 1、92、93、94、95、96、98、99。

Extended data:

Properties of prime numbers:

The (1) prime p has only two divisors: 1 and p.

(2) Basic theorem of elementary mathematics: Any natural number greater than 1 is either a prime number itself or can be decomposed into the product of several prime numbers, and this decomposition is unique.

(3) The number of prime numbers is infinite.

Attribute of composite number:

(1) All even numbers greater than 2 are composite numbers.

(2) In all odd numbers greater than 5, all numbers with 5 are composite numbers.

(3) Except 0, all natural numbers whose unit is 0 are composite numbers.

(4) All natural numbers with units of 4, 6 and 8 are composite numbers.

(5) The minimum (even) composite number is 4 and the minimum odd composite number is 9.

References:

Baidu encyclopedia-prime number

References:

Baidu encyclopedia-composite number