Md. Riday Khan

· 19 Nov 2021

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What are composite numbers

The number of factors that have 1 or more numbers in addition to that number is called a composite number. For example, if we go to discuss whether the number 9 is fundamental or compound, we will see that there are more numbers besides 1 and 9 in the factor of 9=1*9= 3*3
That is, the factors of 9 are 1, 3 and 9. Since there is 1 and another number (3) besides that number, 9 is a composite number. A few more composite numbers are 4, 6, 7, 10, 12, 14, 15, 16, 18, 20 etc.


The method of determining the number of compounds
We have discussed the method of determining the method of prime numbers in the writing of prime numbers. In the same way we can determine the number of compounds. In other words, in that process we will see whether the number is basic or not? If not prime, then the number is composite. For your convenience, I am mentioning the process again with examples.

1. Assuming we will determine whether the number 39 is a compound?
2. For this we first need to take a whole number around 39. We took 36. Because if we square it, we get the whole number which is 7.
3. Now we have to see which are the prime numbers smaller than 8. The prime numbers smaller than 8 are 2, 3 and 5.
4. Now we will try to divide 39 by these 2, 3 and 5. If a number is evenly divisible, then the number is a composite number. So if we divide 39 by 2, some remainder remains. Divided by 5, the same situation. However, if we divide 39 by 3, it becomes infinitely divisible where the quotient is 13/39
/
3 = 13. That is, the number 39 is a composite number.

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