It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 491 609 916 is not a prime number.
For example, 491 609 916 can be divided by 2: 491 609 916 / 2 = 245 804 958.
For 491 609 916 to be a prime number, it would have been required that 491 609 916 has only two divisors, i.e., itself and 1.
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491 609 916 is an even number, because it is evenly divisible by 2: 491 609 916 / 2 = 245 804 958.
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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 491 609 916 is about 22 172.278.
Thus, the square root of 491 609 916 is not an integer, and therefore 491 609 916 is not a square number.
The square of a number (here 491 609 916) is the result of the product of this number (491 609 916) by itself (i.e., 491 609 916 × 491 609 916); the square of 491 609 916 is sometimes called "raising 491 609 916 to the power 2", or "491 609 916 squared".
The square of 491 609 916 is 241 680 309 509 527 040 because 491 609 916 × 491 609 916 = 491 609 9162 = 241 680 309 509 527 040.
As a consequence, 491 609 916 is the square root of 241 680 309 509 527 040.
491 609 916 is a number with 9 digits.
The multiples of 491 609 916 are all integers evenly divisible by 491 609 916, that is all numbers such that the remainder of the division by 491 609 916 is zero. There are infinitely many multiples of 491 609 916. The smallest multiples of 491 609 916 are: