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Is the numbers 19 21 and 23 a composite number?
No, the numbers 19, 21, and 23 are not composite numbers. A composite number is a positive integer greater than 1 that has more than two distinct positive divisors. In the case of these numbers, 19 and 23 are prime numbers because they are only divisible by 1 and themselves, while 21 is a composite number because it has divisors other than 1 and itself (3 and 7).
What are 21's composite numbers?
The factors of 21 are 1, 3, 7, and 21. The only factor of 21 that is a composite number is 21.
How many composite numbers are between 1 and 21?
12 numbers (including 21). The numbers are 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21.
What prime numbers 21?
A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite. 21 is composite.
What are the composite numbers below 40?
1,4,6,8,9,10,12,14,15,16,18,20,21,22,24,25,26,27,28,30,32,33,34,35,36,38,39 are the composite numbers between 1 and 40.
