odd, prime, Fibonacci, triangular, palindrome · 3rd positive integer
The number 3
3 is an odd prime number. It's known as the smallest odd prime and the second prime. It is the 3rd positive integer.
Quick reference
| Prime factorization | 3 (prime) |
| Divisors | 1, 3 |
| Binary | 11 |
| Hexadecimal | 0x3 |
| Roman numeral | III |
| Digit sum | 3 |
| Properties | odd, prime, Fibonacci, triangular, palindrome |
Why 3 is notable
The smallest odd prime and the second prime.
Reading 3 in NumGrid context
The 3 record above pulls directly from classical number theory plus NumGrid solver-derived puzzle statistics. What follows is the per-entity context — how 3 sits in the broader integer properties and number-guessing puzzles distribution and which underlying factors drive the headline numbers.
Every number on this page links back to classical number theory plus NumGrid solver-derived puzzle statistics; the methodology page describes the inputs, refresh cadence, and known limitations of the underlying data product.
Practical use of this page is in combination with the comparison and ranking pages elsewhere on the site, which surface the same data for 3’s peers within positive integers within the NumGrid target pool. A single-entity reading without peer context can be misleading when an entity is an outlier on one axis but typical on another.
Frequently asked
Is 3 a prime number?
Yes. 3 is prime — its only divisors are 1 and itself.
What are the factors of 3?
The factors (divisors) of 3 are 1, 3.
What is 3 in binary?
3 in binary is 11. In hexadecimal it's 3.
What is 3 as a Roman numeral?
3 in Roman numerals is III.
What's the digit sum of 3?
Adding the digits of 3: 3 = 3.