It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 491 609 is not a prime number.
For example, 491 609 can be divided by 83: 491 609 / 83 = 5 923.
For 491 609 to be a prime number, it would have been required that 491 609 has only two divisors, i.e., itself and 1.
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491 609 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 491 609 is about 701.148.
Thus, the square root of 491 609 is not an integer, and therefore 491 609 is not a square number.
The square of a number (here 491 609) is the result of the product of this number (491 609) by itself (i.e., 491 609 × 491 609); the square of 491 609 is sometimes called "raising 491 609 to the power 2", or "491 609 squared".
The square of 491 609 is 241 679 408 881 because 491 609 × 491 609 = 491 6092 = 241 679 408 881.
As a consequence, 491 609 is the square root of 241 679 408 881.
The multiples of 491 609 are all integers evenly divisible by 491 609, that is all numbers such that the remainder of the division by 491 609 is zero. There are infinitely many multiples of 491 609. The smallest multiples of 491 609 are: