It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 216 009 is not a prime number.
For example, 216 009 can be divided by 3: 216 009 / 3 = 72 003.
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For 216 009 to be a prime number, it would have been required that 216 009 has only two divisors, i.e., itself and 1.
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216 009 is an odd number, because it is not evenly divisible by 2.
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A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 216 009 is about 464.768.
Thus, the square root of 216 009 is not an integer, and therefore 216 009 is not a square number.
The square of a number (here 216 009) is the result of the product of this number (216 009) by itself (i.e., 216 009 × 216 009); the square of 216 009 is sometimes called "raising 216 009 to the power 2", or "216 009 squared".
The square of 216 009 is 46 659 888 081 because 216 009 × 216 009 = 216 0092 = 46 659 888 081.
As a consequence, 216 009 is the square root of 46 659 888 081.
The multiples of 216 009 are all integers evenly divisible by 216 009, that is all numbers such that the remainder of the division by 216 009 is zero. There are infinitely many multiples of 216 009. The smallest multiples of 216 009 are: