Any number whose digits add up to 9 or a multiple of 9 is divisible by 9. Since the numbers' digits also add up to a multiple of 3, 441 is also divisible by 3.
A complete list of all of the positive integer factors of the number is:
1, 3, 7, 9, 21, 49, 63, 147, 441
441 is a composite number. A Prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.
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It is prime
86 is not a prime number, so is a composite.
No, prime numbers refer to whole numbers, not decimals.
No 168 is not a prime number it is a composite number
composite