4 — math

4 is the natural number the proceeds 3 and precedes 5.

Properties

The prime factorization is 2².
A number is divisible by 4 if the last 2 digits are divisible by 4 in base-10.
4 is a highly composite number, meaning that it has more factors than all the numbers smaller than it.
- 4's divisors are 1, 2, and 4.
4 is the smallest composite number.
4 is the only number with its number of letters in its name.
It is the 2nd square number (exceeding 1 & preceeding 9).
4 is the second even number.
4 is the first semiprime.
Four is the only number with n characters in its name.

1 × 4 = 4

2 × 4 = 8

3 × 4 = 12

4 × 4 = 16

5 × 4 = 20

6 × 4 = 24

7 × 4 = 28

8 × 4 = 32

9 × 4 = 36

10 × 4 = 40

11 × 4 = 44

12 × 4 = 48

There are 4 cardinal directions: North, South, East, West.
- There are also 4 diagonal cardinal directions.
There are 4 seasons (US-centric): Winter, Spring, Summer, Autumn.
Tables have 4 legs.
Animals have 4 legs.
Ludo is one of the most popular 4-player games.
4 imperial cups make one quart.
4 imperial quarts make one gallon.
Many songs have a 4-count beat at the start (x/4).
A whole note in music is four beats.
Cars typically have four wheels.
4-dimensional numbers are known as "Quaternions".
In some East Asian cultures, the number four is considered unlucky because in their respective languages, it is a homophone for "death".

4's value is: