It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 491 397 is not a prime number.
For example, 491 397 can be divided by 3: 491 397 / 3 = 163 799.
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For 491 397 to be a prime number, it would have been required that 491 397 has only two divisors, i.e., itself and 1.
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491 397 is an odd number, because it is not evenly divisible by 2.
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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 491 397 is about 700.997.
Thus, the square root of 491 397 is not an integer, and therefore 491 397 is not a square number.
The square of a number (here 491 397) is the result of the product of this number (491 397) by itself (i.e., 491 397 × 491 397); the square of 491 397 is sometimes called "raising 491 397 to the power 2", or "491 397 squared".
The square of 491 397 is 241 471 011 609 because 491 397 × 491 397 = 491 3972 = 241 471 011 609.
As a consequence, 491 397 is the square root of 241 471 011 609.
The multiples of 491 397 are all integers evenly divisible by 491 397, that is all numbers such that the remainder of the division by 491 397 is zero. There are infinitely many multiples of 491 397. The smallest multiples of 491 397 are: