0 represents the origin and the datum on the number axis. This view is widely applied to various physical quantities.
0 is neither positive nor negative. 0 is an even number, but it is not a prime number or a composite number.
"When an integer A is divided by an integer b(b≠0), the quotient is exactly an integer with no remainder, so we say that A is divisible by B (or that B is divisible by A)." It is not excluded that A=0.
"If the number A is divisible by the number B (b ≠ 0)" A is called a multiple of B, and B is called a divisor (or a factor of A). Multiplication and divisor are interdependent. "Does not rule out a=0.
"Note: For convenience, when we study divisors and multiples in the future, the numbers mentioned generally do not include 0." Exclude the possibility that the multiple is 0 and the interference of 0, so as to prepare for studying the least common multiple in the future. The divisor of a number is finite, in which the smallest divisor is 1 and the largest divisor is itself. Provide the necessary conditions.
"Numbers divisible by 2 are called even numbers; Numbers that are not divisible by 2 are called odd numbers. Note: Because 0 can also be divisible by 2, 0 is an even number. " Under special circumstances, when learning multiples, it also contains 0.
If a number has only 1 and its two divisors, such a number is called a prime number. Whether it is general or special, 0 is inseparable and irreducible. 0 is not a divisor of itself, so 0 is not a prime number.
If a number has other divisors besides 1 and itself, it is called a composite number. Judging from the determination of this composite number, if a number is a composite number, it must meet two conditions: 1, and the divisor must have 1 and itself; 2. Besides itself, there are 1 and divisors. The divisor of 0 does not have itself, so it seems that 0 does not meet the first rule, so 0 is not a composite number.