It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 542 238 is not a prime number.
For example, 542 238 can be divided by 2: 542 238 / 2 = 271 119.
For 542 238 to be a prime number, it would have been required that 542 238 has only two divisors, i.e., itself and 1.
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542 238 is an even number, because it is evenly divisible by 2: 542 238 / 2 = 271 119.
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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 542 238 is about 736.368.
Thus, the square root of 542 238 is not an integer, and therefore 542 238 is not a square number.
The square of a number (here 542 238) is the result of the product of this number (542 238) by itself (i.e., 542 238 × 542 238); the square of 542 238 is sometimes called "raising 542 238 to the power 2", or "542 238 squared".
The square of 542 238 is 294 022 048 644 because 542 238 × 542 238 = 542 2382 = 294 022 048 644.
As a consequence, 542 238 is the square root of 294 022 048 644.
The multiples of 542 238 are all integers evenly divisible by 542 238, that is all numbers such that the remainder of the division by 542 238 is zero. There are infinitely many multiples of 542 238. The smallest multiples of 542 238 are: