Factors of 2
The factors of 2 are 1, 2. Yes, 2 is a prime number. Its only factors are 1 and 2.
Factor pairs of 2
Every factor has a partner that multiplies with it to give 2. Listing pairs from the outside in is the fastest way to find all the factors: once the two numbers in a pair meet in the middle, you have them all.
| Pair | Check |
|---|---|
| 1 and 2 | 1 × 2 = 2 |
Prime factorization of 2, step by step
2 is prime, so the ladder is one rung: nothing smaller than 2 divides it except 1. To confirm, you only need to test primes up to √2 ≈ 1: -- no primes to test at all.
Divisibility checks for 2
The quick rules a student uses before dividing, applied to 2:
| Divisible by | Rule | For 2 | Result |
|---|---|---|---|
| 2 | last digit is even | last digit 2 | yes |
| 3 | digit sum divisible by 3 | digits add to 2 | no |
| 4 | last two digits divisible by 4 | 2 ÷ 4 | no |
| 5 | last digit is 0 or 5 | last digit 2 | no |
| 6 | divisible by both 2 and 3 | even, digit sum 2 | no |
| 8 | last three digits divisible by 8 | 2 ÷ 8 | no |
| 9 | digit sum divisible by 9 | digits add to 2 | no |
| 10 | last digit is 0 | last digit 2 | no |
Frequently Asked Questions
What are the factors of 2?
The factors of 2 are 1, 2.
Is 2 a prime number?
Yes, 2 is a prime number. Its only factors are 1 and 2.
How many factors does 2 have?
2 has 2 factors.
Is 2 even or odd?
2 is even (2 is one of its factors).
What is the sum of the factors of 2?
1 + 2 = 3. Leaving out 2 itself, the proper factors add to 1, less than 2, so 2 is a deficient number.
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