It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 491 915 164 is not a prime number.
For example, 491 915 164 can be divided by 2: 491 915 164 / 2 = 245 957 582.
For 491 915 164 to be a prime number, it would have been required that 491 915 164 has only two divisors, i.e., itself and 1.
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491 915 164 is an even number, because it is evenly divisible by 2: 491 915 164 / 2 = 245 957 582.
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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 491 915 164 is about 22 179.161.
Thus, the square root of 491 915 164 is not an integer, and therefore 491 915 164 is not a square number.
The square of a number (here 491 915 164) is the result of the product of this number (491 915 164) by itself (i.e., 491 915 164 × 491 915 164); the square of 491 915 164 is sometimes called "raising 491 915 164 to the power 2", or "491 915 164 squared".
The square of 491 915 164 is 241 980 528 573 146 880 because 491 915 164 × 491 915 164 = 491 915 1642 = 241 980 528 573 146 880.
As a consequence, 491 915 164 is the square root of 241 980 528 573 146 880.
491 915 164 is a number with 9 digits.
The multiples of 491 915 164 are all integers evenly divisible by 491 915 164, that is all numbers such that the remainder of the division by 491 915 164 is zero. There are infinitely many multiples of 491 915 164. The smallest multiples of 491 915 164 are: