It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 491 238 is not a prime number.
For example, 491 238 can be divided by 2: 491 238 / 2 = 245 619.
For 491 238 to be a prime number, it would have been required that 491 238 has only two divisors, i.e., itself and 1.
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491 238 is an even number, because it is evenly divisible by 2: 491 238 / 2 = 245 619.
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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 491 238 is about 700.884.
Thus, the square root of 491 238 is not an integer, and therefore 491 238 is not a square number.
The square of a number (here 491 238) is the result of the product of this number (491 238) by itself (i.e., 491 238 × 491 238); the square of 491 238 is sometimes called "raising 491 238 to the power 2", or "491 238 squared".
The square of 491 238 is 241 314 772 644 because 491 238 × 491 238 = 491 2382 = 241 314 772 644.
As a consequence, 491 238 is the square root of 241 314 772 644.
The multiples of 491 238 are all integers evenly divisible by 491 238, that is all numbers such that the remainder of the division by 491 238 is zero. There are infinitely many multiples of 491 238. The smallest multiples of 491 238 are: