Even number: a number divisible by 2, such as 2, 4, 6, 8.

Prime number: Prime number is also called prime number (prime number is also called prime number), which refers to a number that has no other divisor except 1 and itself, such as 2, 3, 5, 7,1,13, 17.

Complex number: There are other divisors besides 1 and itself, such as 4, 6, 8, 9, 10, 12, 14, 15, 16,/kloc.

Note: 0 and 1 are neither prime numbers nor composite numbers.

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