It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 489 658 is not a prime number.
For example, 489 658 can be divided by 2: 489 658 / 2 = 244 829.
For 489 658 to be a prime number, it would have been required that 489 658 has only two divisors, i.e., itself and 1.
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489 658 is an even number, because it is evenly divisible by 2: 489 658 / 2 = 244 829.
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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 489 658 is about 699.756.
Thus, the square root of 489 658 is not an integer, and therefore 489 658 is not a square number.
The square of a number (here 489 658) is the result of the product of this number (489 658) by itself (i.e., 489 658 × 489 658); the square of 489 658 is sometimes called "raising 489 658 to the power 2", or "489 658 squared".
The square of 489 658 is 239 764 956 964 because 489 658 × 489 658 = 489 6582 = 239 764 956 964.
As a consequence, 489 658 is the square root of 239 764 956 964.
The multiples of 489 658 are all integers evenly divisible by 489 658, that is all numbers such that the remainder of the division by 489 658 is zero. There are infinitely many multiples of 489 658. The smallest multiples of 489 658 are: