It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 495 238 is not a prime number.
For example, 495 238 can be divided by 2: 495 238 / 2 = 247 619.
For 495 238 to be a prime number, it would have been required that 495 238 has only two divisors, i.e., itself and 1.
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495 238 is an even number, because it is evenly divisible by 2: 495 238 / 2 = 247 619.
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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 495 238 is about 703.731.
Thus, the square root of 495 238 is not an integer, and therefore 495 238 is not a square number.
The square of a number (here 495 238) is the result of the product of this number (495 238) by itself (i.e., 495 238 × 495 238); the square of 495 238 is sometimes called "raising 495 238 to the power 2", or "495 238 squared".
The square of 495 238 is 245 260 676 644 because 495 238 × 495 238 = 495 2382 = 245 260 676 644.
As a consequence, 495 238 is the square root of 245 260 676 644.
The multiples of 495 238 are all integers evenly divisible by 495 238, that is all numbers such that the remainder of the division by 495 238 is zero. There are infinitely many multiples of 495 238. The smallest multiples of 495 238 are: