It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 491 278 is not a prime number.
For example, 491 278 can be divided by 2: 491 278 / 2 = 245 639.
For 491 278 to be a prime number, it would have been required that 491 278 has only two divisors, i.e., itself and 1.
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491 278 is an even number, because it is evenly divisible by 2: 491 278 / 2 = 245 639.
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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 491 278 is about 700.912.
Thus, the square root of 491 278 is not an integer, and therefore 491 278 is not a square number.
The square of a number (here 491 278) is the result of the product of this number (491 278) by itself (i.e., 491 278 × 491 278); the square of 491 278 is sometimes called "raising 491 278 to the power 2", or "491 278 squared".
The square of 491 278 is 241 354 073 284 because 491 278 × 491 278 = 491 2782 = 241 354 073 284.
As a consequence, 491 278 is the square root of 241 354 073 284.
The multiples of 491 278 are all integers evenly divisible by 491 278, that is all numbers such that the remainder of the division by 491 278 is zero. There are infinitely many multiples of 491 278. The smallest multiples of 491 278 are: