It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 491 011 016 is not a prime number.
For example, 491 011 016 can be divided by 2: 491 011 016 / 2 = 245 505 508.
For 491 011 016 to be a prime number, it would have been required that 491 011 016 has only two divisors, i.e., itself and 1.
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491 011 016 is an even number, because it is evenly divisible by 2: 491 011 016 / 2 = 245 505 508.
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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 491 011 016 is about 22 158.768.
Thus, the square root of 491 011 016 is not an integer, and therefore 491 011 016 is not a square number.
The square of a number (here 491 011 016) is the result of the product of this number (491 011 016) by itself (i.e., 491 011 016 × 491 011 016); the square of 491 011 016 is sometimes called "raising 491 011 016 to the power 2", or "491 011 016 squared".
The square of 491 011 016 is 241 091 817 833 352 256 because 491 011 016 × 491 011 016 = 491 011 0162 = 241 091 817 833 352 256.
As a consequence, 491 011 016 is the square root of 241 091 817 833 352 256.
491 011 016 is a number with 9 digits.
The multiples of 491 011 016 are all integers evenly divisible by 491 011 016, that is all numbers such that the remainder of the division by 491 011 016 is zero. There are infinitely many multiples of 491 011 016. The smallest multiples of 491 011 016 are: