It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 491 316 is not a prime number.
For example, 491 316 can be divided by 2: 491 316 / 2 = 245 658.
For 491 316 to be a prime number, it would have been required that 491 316 has only two divisors, i.e., itself and 1.
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491 316 is an even number, because it is evenly divisible by 2: 491 316 / 2 = 245 658.
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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 491 316 is about 700.939.
Thus, the square root of 491 316 is not an integer, and therefore 491 316 is not a square number.
The square of a number (here 491 316) is the result of the product of this number (491 316) by itself (i.e., 491 316 × 491 316); the square of 491 316 is sometimes called "raising 491 316 to the power 2", or "491 316 squared".
The square of 491 316 is 241 391 411 856 because 491 316 × 491 316 = 491 3162 = 241 391 411 856.
As a consequence, 491 316 is the square root of 241 391 411 856.
The multiples of 491 316 are all integers evenly divisible by 491 316, that is all numbers such that the remainder of the division by 491 316 is zero. There are infinitely many multiples of 491 316. The smallest multiples of 491 316 are: