Prime number
Any positive integer greater than zero that has only two proper divisors, 1 and the number itself. Thus the lowest prime number is 2, which is also the only even prime.
Any positive integer greater than zero that has only two proper divisors, 1 and the number itself. Thus the lowest prime number is 2, which is also the only even prime.
A perfect number is a positive integer the sum of whose proper divisors is equal to the number itself.
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| Prime number | |
|---|---|
| Any positive integer greater than zero that has only two proper divisors, 1 and the number itself. Thus the lowest prime number is 2, which is also the only even prime. | |
| 9 | |
| 44 | |