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None of those numbers are composite because:
in math there are composite and prime numbers.
prime numbers can't be factored (have two numbers that multiply to get that number).
prime numbers can only be "made" by multiplying themselves by 1.
exp. only 1 x 11 gives you 11.
composite numbers have factors other than themselves and 1.
exp. you can get 24 by multiplying 12 x2, 8x3, 4x6, 24x1.
3, 5, 7, and 11 are prime numbers.
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A number between 11 and 20 that is both composite and odd?
15 is a composite number - it can be divided by 3 and 5. 11, 13, 17 and 19 are all prime numbers, not composite.
Is 225 composite?
Yes. A composite number is a number that is not prime. In the case of 225, it can be broken down to 5 * 5 * 3 * 3, and is thus composite.
Is the number 55 composite?
Yes. 55 is a composite number and it is divisible by 1, 5, 11, 55
Is 15 prime or composite and why?
15 is a composite number - it is the product of 3 and 5. (3*5=15)
What is the smallest composite number that is divisible by none of the primes 2 3 5 and 7?
It is 11*13 = 143
