It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 258 488 is not a prime number.
For example, 258 488 can be divided by 2: 258 488 / 2 = 129 244.
For 258 488 to be a prime number, it would have been required that 258 488 has only two divisors, i.e., itself and 1.
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258 488 is an even number, because it is evenly divisible by 2: 258 488 / 2 = 129 244.
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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 258 488 is about 508.417.
Thus, the square root of 258 488 is not an integer, and therefore 258 488 is not a square number.
The square of a number (here 258 488) is the result of the product of this number (258 488) by itself (i.e., 258 488 × 258 488); the square of 258 488 is sometimes called "raising 258 488 to the power 2", or "258 488 squared".
The square of 258 488 is 66 816 046 144 because 258 488 × 258 488 = 258 4882 = 66 816 046 144.
As a consequence, 258 488 is the square root of 66 816 046 144.
The multiples of 258 488 are all integers evenly divisible by 258 488, that is all numbers such that the remainder of the division by 258 488 is zero. There are infinitely many multiples of 258 488. The smallest multiples of 258 488 are: