yes
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405 is divisible by: 1, 3, 5, 9, 15, 27, 45, 81, 135, 405.
405 = 3 x 135 = 3 x 3 x 45 = 3 x 3 x 3 x 15 = 3 x 3 x 3 x 3 x 5, so it's divisible by 1, 3, 5, 9, 15, 27, 45, 81, 135 and 405 It is divisible by 9 because its digits add up to 9
All multiples of 405, which is an infinite number.
It is a composite number because 405 is divisible by 5.
no it is divisible by 5.