It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 491 216 is not a prime number.
For example, 491 216 can be divided by 2: 491 216 / 2 = 245 608.
For 491 216 to be a prime number, it would have been required that 491 216 has only two divisors, i.e., itself and 1.
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491 216 is an even number, because it is evenly divisible by 2: 491 216 / 2 = 245 608.
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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 491 216 is about 700.868.
Thus, the square root of 491 216 is not an integer, and therefore 491 216 is not a square number.
The square of a number (here 491 216) is the result of the product of this number (491 216) by itself (i.e., 491 216 × 491 216); the square of 491 216 is sometimes called "raising 491 216 to the power 2", or "491 216 squared".
The square of 491 216 is 241 293 158 656 because 491 216 × 491 216 = 491 2162 = 241 293 158 656.
As a consequence, 491 216 is the square root of 241 293 158 656.
The multiples of 491 216 are all integers evenly divisible by 491 216, that is all numbers such that the remainder of the division by 491 216 is zero. There are infinitely many multiples of 491 216. The smallest multiples of 491 216 are: