405 is divisible by: 1, 3, 5, 9, 15, 27, 45, 81, 135, 405.
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All multiples of 405, which is an infinite number.
yes
It is a composite number because 405 is divisible by 5.
no it is divisible by 5.
405 is composite. Anything that is divisible by more than two numbers (itself and 1) is considered a composite number. Looking at the number, you can tell that it is divisible by 5 because it ends in a 5. There will be more factors, but finding one that is not 1 or itself will cause the number to be composite.