It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 491 486 is not a prime number.
For example, 491 486 can be divided by 2: 491 486 / 2 = 245 743.
For 491 486 to be a prime number, it would have been required that 491 486 has only two divisors, i.e., itself and 1.
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491 486 is an even number, because it is evenly divisible by 2: 491 486 / 2 = 245 743.
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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 491 486 is about 701.061.
Thus, the square root of 491 486 is not an integer, and therefore 491 486 is not a square number.
The square of a number (here 491 486) is the result of the product of this number (491 486) by itself (i.e., 491 486 × 491 486); the square of 491 486 is sometimes called "raising 491 486 to the power 2", or "491 486 squared".
The square of 491 486 is 241 558 488 196 because 491 486 × 491 486 = 491 4862 = 241 558 488 196.
As a consequence, 491 486 is the square root of 241 558 488 196.
The multiples of 491 486 are all integers evenly divisible by 491 486, that is all numbers such that the remainder of the division by 491 486 is zero. There are infinitely many multiples of 491 486. The smallest multiples of 491 486 are: