2. Besides 1 and its two divisors, there are other divisors called composite numbers. (For example, 4 ÷1= 4,4 ÷ 2 = 2,4 ÷ 4 =1. Obviously, the divisor of 4 includes the divisor 2 besides the two divisors of 1 and itself 4, so 4 is a composite number. )
3. 1 is neither a prime number nor a composite number. Because its divisor has only the divisor of 1
Judging whether a number is a prime number or a composite number can be determined according to the number of its divisors: only two divisors are prime numbers; Numbers with three or more divisors are composite numbers; Numbers with only one divisor are neither prime nor composite.
Defendant: 1. 1. 2. 2. 3. Defendant: 2.
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The Sorcerer's Apprentice
assistant
9- 16
09:32
What is a prime number? That is to say, among all integers greater than 1, there is no divisor except 1 and itself. This integer is called prime number, and prime number is also called prime number. It can also be said that prime numbers have two divisors.
A composite number, also called a composite number, is a positive integer that satisfies one of the following (equivalent) conditions:
1. is two numbers larger than.
1
Product of integers;
Have something greater than ...
1
But less than its own factor;
3. There are at least three factors (factors);
4. Number
1
Nor is it a prime number (prime number);
5. Non-prime numbers with at least one prime factor.
The following are conclusions about complex numbers and some special complex numbers:
A composite number has an odd number of factors (factors) if and only if it is a complete square number.
Edited on 2019-11-28.
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