even, prime, Fibonacci, palindrome · 2nd positive integer
The number 2
2 is an even prime number. It's known as the smallest prime and the only even prime. It is the 2nd positive integer.
Quick reference
| Prime factorization | 2 (prime) |
| Divisors | 1, 2 |
| Binary | 10 |
| Hexadecimal | 0x2 |
| Roman numeral | II |
| Digit sum | 2 |
| Properties | even, prime, Fibonacci, palindrome |
Why 2 is notable
The smallest prime and the only even prime.
Frequently asked
Is 2 a prime number?
Yes. 2 is prime — its only divisors are 1 and itself.
What are the factors of 2?
The factors (divisors) of 2 are 1, 2.
What is 2 in binary?
2 in binary is 10. In hexadecimal it's 2.
What is 2 as a Roman numeral?
2 in Roman numerals is II.
What's the digit sum of 2?
Adding the digits of 2: 2 = 2.