It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 258 342 is not a prime number.
For example, 258 342 can be divided by 2: 258 342 / 2 = 129 171.
For 258 342 to be a prime number, it would have been required that 258 342 has only two divisors, i.e., itself and 1.
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258 342 is an even number, because it is evenly divisible by 2: 258 342 / 2 = 129 171.
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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 258 342 is about 508.274.
Thus, the square root of 258 342 is not an integer, and therefore 258 342 is not a square number.
The square of a number (here 258 342) is the result of the product of this number (258 342) by itself (i.e., 258 342 × 258 342); the square of 258 342 is sometimes called "raising 258 342 to the power 2", or "258 342 squared".
The square of 258 342 is 66 740 588 964 because 258 342 × 258 342 = 258 3422 = 66 740 588 964.
As a consequence, 258 342 is the square root of 66 740 588 964.
The multiples of 258 342 are all integers evenly divisible by 258 342, that is all numbers such that the remainder of the division by 258 342 is zero. There are infinitely many multiples of 258 342. The smallest multiples of 258 342 are: