It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 491 604 is not a prime number.
For example, 491 604 can be divided by 2: 491 604 / 2 = 245 802.
For 491 604 to be a prime number, it would have been required that 491 604 has only two divisors, i.e., itself and 1.
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491 604 is an even number, because it is evenly divisible by 2: 491 604 / 2 = 245 802.
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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 491 604 is about 701.145.
Thus, the square root of 491 604 is not an integer, and therefore 491 604 is not a square number.
The square of a number (here 491 604) is the result of the product of this number (491 604) by itself (i.e., 491 604 × 491 604); the square of 491 604 is sometimes called "raising 491 604 to the power 2", or "491 604 squared".
The square of 491 604 is 241 674 492 816 because 491 604 × 491 604 = 491 6042 = 241 674 492 816.
As a consequence, 491 604 is the square root of 241 674 492 816.
The multiples of 491 604 are all integers evenly divisible by 491 604, that is all numbers such that the remainder of the division by 491 604 is zero. There are infinitely many multiples of 491 604. The smallest multiples of 491 604 are: