It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 491 428 is not a prime number.
For example, 491 428 can be divided by 2: 491 428 / 2 = 245 714.
For 491 428 to be a prime number, it would have been required that 491 428 has only two divisors, i.e., itself and 1.
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491 428 is an even number, because it is evenly divisible by 2: 491 428 / 2 = 245 714.
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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 491 428 is about 701.019.
Thus, the square root of 491 428 is not an integer, and therefore 491 428 is not a square number.
The square of a number (here 491 428) is the result of the product of this number (491 428) by itself (i.e., 491 428 × 491 428); the square of 491 428 is sometimes called "raising 491 428 to the power 2", or "491 428 squared".
The square of 491 428 is 241 501 479 184 because 491 428 × 491 428 = 491 4282 = 241 501 479 184.
As a consequence, 491 428 is the square root of 241 501 479 184.
The multiples of 491 428 are all integers evenly divisible by 491 428, that is all numbers such that the remainder of the division by 491 428 is zero. There are infinitely many multiples of 491 428. The smallest multiples of 491 428 are: