Yes, 15 is an odd number.
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15 is an odd number.
No 9 and 15 is not a number, they are two numbers.
'5' & '15' are odd numbers less than 20 , and are also multiples of '5'.
15 does.
9 is the smallest natural number that is odd and composite: 9=3*3. 15 is the smallest natural number that is odd and a product of two numbers different from one and from each other: 15=3*5.