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15 and 9 are both odd, composite numbers less than 20.

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15y ago

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Can you tell a prime or composite number by seeing if its odd or even?

You cannot. If a number is even - other than 2 - then it is a composite number. However, if it is odd, it is not easily possible to tell whether it is prime or composite.


What number is both odd and composite number?

The number 9 is an example of a number that is both odd and composite. An odd number is one that is not divisible by 2, and a composite number is one that has more than two positive divisors. In the case of 9, its divisors are 1, 3, and 9, making it composite as well as odd. Other examples include 15, 21, and 25.


Why can an odd number be composite?

Any positive integer with more than two factors is composite.


Explain why 7654321 plus 5 is a composite number?

The first number is odd, the second is odd. Odd + Odd = Even ie the sum is even. Either number is greater than 2 so their sum is greater than 2. All even numbers greater than 2 are composite.


What are composite odd numbers?

An odd number is an integer that is not evenly divisible by 2. A composite number is a positive number that has divisors other than 1 and itself. So any odd number greater than 1 that is not prime would be a composite odd number. For example, 9, 15, 21, and 25 are odd composite number because the are odd and they have divisors. 1, 3, 5, and 7 are not composite because they are only divisible by 1 and themselves.


Can odd numbers be composite?

If an odd number has more than two factors then it is a composite number but if it has only two factors then it is a prime number. Although all prime numbers are odd except for 2 many more odd numbers are composite numbers having more than two factors as for example 21 is an odd number whose factors are 1, 3, 7 and 21.


What is the only 2 digit odd composite number less than 20?

would it will be 15


What is the smallest odd composite number?

A composite number is a number with more than 2 positive integer factors. The smallest such odd number is 9.


Is 21 a even number or a odd number?

21 is an odd composite number


Is 35 an even or odd number?

35 is an odd composite number


Does composite numbers have to be odd explain why?

The answer is 'no', so there isn't any 'why'. As a matter of fact, every EVEN number except 2 is composite, and every prime number bigger than 2 is odd..


Can an composite number be an odd number?

Yes