Numerosidad Number Atlas
The number 4, visualized
Four is the first composite number, the square of 2, and the next positive power of two after 2.
These PNG and SVG visualization files are dedicated under CC0 1.0 Universal. You may use them for any purpose without asking permission or giving credit. They are ready for classroom lessons, worksheets, presentations, and home math practice. Read the scope and exclusions.
Read the visual
Fixed-value symbol model for 4
four ones
Four circle-shaped fixed-value symbols worth 1 each supply the ones digit and combine to make 4.
This additive decimal model decomposes the number into repeated fixed-value symbols. Each symbol keeps its value wherever it appears, and repetitions add, so the complete pattern composes 4.
- four ones
- 4
Number profile
Facts about 4
- Standard form
- 4
- Number name (word form)
- four
- Expanded form
- 4
- Classification
- Even and composite
- Prime factorization
- 22
- Positive divisors (3)
- 1, 2, 4
- Digits
- 1
- Digit sum
- 4
- Digital root
- 4
- Fixed-value symbols
- 4
Created and reviewed by Entropycal Studio LLC · Reviewed · How this page was created and checked
Why it stands out
Patterns inside 4
The number 4 is the first point where equal grouping creates a composite number and a square arrangement at once.
It is the first composite number
The positive divisors 1, 2, and 4 give it more than the two divisors allowed for a prime; no smaller positive composite number exists.
One equation supplies two classifications
Because 4 = 2 × 2 = 2², it is simultaneously a perfect square and a power of two.
Its prime factorization repeats 2
The factorization 4 = 2² shows that both of its prime factors are the same smallest prime.