It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 245 842 is not a prime number.
For example, 245 842 can be divided by 2: 245 842 / 2 = 122 921.
For 245 842 to be a prime number, it would have been required that 245 842 has only two divisors, i.e., itself and 1.
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245 842 is an even number, because it is evenly divisible by 2: 245 842 / 2 = 122 921.
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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 245 842 is about 495.825.
Thus, the square root of 245 842 is not an integer, and therefore 245 842 is not a square number.
The square of a number (here 245 842) is the result of the product of this number (245 842) by itself (i.e., 245 842 × 245 842); the square of 245 842 is sometimes called "raising 245 842 to the power 2", or "245 842 squared".
The square of 245 842 is 60 438 288 964 because 245 842 × 245 842 = 245 8422 = 60 438 288 964.
As a consequence, 245 842 is the square root of 60 438 288 964.
The multiples of 245 842 are all integers evenly divisible by 245 842, that is all numbers such that the remainder of the division by 245 842 is zero. There are infinitely many multiples of 245 842. The smallest multiples of 245 842 are: