It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 489 309 is not a prime number.
For example, 489 309 can be divided by 3: 489 309 / 3 = 163 103.
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For 489 309 to be a prime number, it would have been required that 489 309 has only two divisors, i.e., itself and 1.
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489 309 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 489 309 is about 699.506.
Thus, the square root of 489 309 is not an integer, and therefore 489 309 is not a square number.
The square of a number (here 489 309) is the result of the product of this number (489 309) by itself (i.e., 489 309 × 489 309); the square of 489 309 is sometimes called "raising 489 309 to the power 2", or "489 309 squared".
The square of 489 309 is 239 423 297 481 because 489 309 × 489 309 = 489 3092 = 239 423 297 481.
As a consequence, 489 309 is the square root of 239 423 297 481.
The multiples of 489 309 are all integers evenly divisible by 489 309, that is all numbers such that the remainder of the division by 489 309 is zero. There are infinitely many multiples of 489 309. The smallest multiples of 489 309 are: