It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 8 509 is not a prime number.
For example, 8 509 can be divided by 67: 8 509 / 67 = 127.
For 8 509 to be a prime number, it would have been required that 8 509 has only two divisors, i.e., itself and 1.
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8 509 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 8 509 is about 92.244.
Thus, the square root of 8 509 is not an integer, and therefore 8 509 is not a square number.
The square of a number (here 8 509) is the result of the product of this number (8 509) by itself (i.e., 8 509 × 8 509); the square of 8 509 is sometimes called "raising 8 509 to the power 2", or "8 509 squared".
The square of 8 509 is 72 403 081 because 8 509 × 8 509 = 8 5092 = 72 403 081.
As a consequence, 8 509 is the square root of 72 403 081.
The multiples of 8 509 are all integers evenly divisible by 8 509, that is all numbers such that the remainder of the division by 8 509 is zero. There are infinitely many multiples of 8 509. The smallest multiples of 8 509 are: