Because fifteen is a compound number. That is it is a multiple of 5 & 3 .
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15,485,863 (fifteen million four hundred eighty five thousand eight hundred sixty three) is the one millionth prime number.
Fifteen ten thousandths
Fifteen trillion.
You is called a prime number!You is called a prime number!You is called a prime number!You is called a prime number!
A prime number times a prime number is a composite number. Since prime numbers, except for 2, are odd numbers, a prime number times a prime number is usually an odd number. It will only be an even number if one of the prime numbers is 2. A prime number times a prime number will be a number with four factors unless both prime numbers are the same, in which case it will be a square number with only three factors.