Prime numbers are natural numbers greater than 1 that have no divisors other than 1 and themselves. Composite numbers, on the other hand, are natural numbers greater than 1 that have more than two divisors.
Here are the prime and composite numbers less than 20:
Prime Numbers:
- 2
- 3
- 5
- 7
- 11
- 13
- 17
- 19
Composite Numbers:
- 4
- 6
- 8
- 9
- 10
- 12
- 14
- 15
- 16
- 18
As we can see, the prime numbers under 20 are limited to those that cannot be formed by multiplying two smaller natural numbers. Conversely, composite numbers can be formed by multiplying smaller numbers together.