It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 258 742 is not a prime number.
For example, 258 742 can be divided by 2: 258 742 / 2 = 129 371.
For 258 742 to be a prime number, it would have been required that 258 742 has only two divisors, i.e., itself and 1.
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258 742 is an even number, because it is evenly divisible by 2: 258 742 / 2 = 129 371.
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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 258 742 is about 508.667.
Thus, the square root of 258 742 is not an integer, and therefore 258 742 is not a square number.
The square of a number (here 258 742) is the result of the product of this number (258 742) by itself (i.e., 258 742 × 258 742); the square of 258 742 is sometimes called "raising 258 742 to the power 2", or "258 742 squared".
The square of 258 742 is 66 947 422 564 because 258 742 × 258 742 = 258 7422 = 66 947 422 564.
As a consequence, 258 742 is the square root of 66 947 422 564.
The multiples of 258 742 are all integers evenly divisible by 258 742, that is all numbers such that the remainder of the division by 258 742 is zero. There are infinitely many multiples of 258 742. The smallest multiples of 258 742 are: