Joke Collection Website - Mood Talk - How many prime numbers are there from 1 to 15? What about the sum? By the way, let’s talk about the meaning of prime numbers and appropriateness. !

How many prime numbers are there from 1 to 15? What about the sum? By the way, let’s talk about the meaning of prime numbers and appropriateness. !

Among 1 ~ 15, the prime numbers are 2, 3, 5, 7, 11, 13.

The composite numbers are 4, 6, 8, 9, 10, 12, 14, 15.

A prime number is a number with only two factors: 1 and itself.

A composite number is a number that has other factors besides 1 and itself.

If it is helpful to you, please adopt it. Thanks.

This is the first answer. Wish you progress! ! !