It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 13 609 is not a prime number.
For example, 13 609 can be divided by 31: 13 609 / 31 = 439.
For 13 609 to be a prime number, it would have been required that 13 609 has only two divisors, i.e., itself and 1.
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13 609 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 13 609 is about 116.658.
Thus, the square root of 13 609 is not an integer, and therefore 13 609 is not a square number.
The square of a number (here 13 609) is the result of the product of this number (13 609) by itself (i.e., 13 609 × 13 609); the square of 13 609 is sometimes called "raising 13 609 to the power 2", or "13 609 squared".
The square of 13 609 is 185 204 881 because 13 609 × 13 609 = 13 6092 = 185 204 881.
As a consequence, 13 609 is the square root of 185 204 881.
The multiples of 13 609 are all integers evenly divisible by 13 609, that is all numbers such that the remainder of the division by 13 609 is zero. There are infinitely many multiples of 13 609. The smallest multiples of 13 609 are: