It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 258 502 is not a prime number.
For example, 258 502 can be divided by 2: 258 502 / 2 = 129 251.
For 258 502 to be a prime number, it would have been required that 258 502 has only two divisors, i.e., itself and 1.
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258 502 is an even number, because it is evenly divisible by 2: 258 502 / 2 = 129 251.
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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 258 502 is about 508.431.
Thus, the square root of 258 502 is not an integer, and therefore 258 502 is not a square number.
The square of a number (here 258 502) is the result of the product of this number (258 502) by itself (i.e., 258 502 × 258 502); the square of 258 502 is sometimes called "raising 258 502 to the power 2", or "258 502 squared".
The square of 258 502 is 66 823 284 004 because 258 502 × 258 502 = 258 5022 = 66 823 284 004.
As a consequence, 258 502 is the square root of 66 823 284 004.
The multiples of 258 502 are all integers evenly divisible by 258 502, that is all numbers such that the remainder of the division by 258 502 is zero. There are infinitely many multiples of 258 502. The smallest multiples of 258 502 are: