It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 491 387 is not a prime number.
For example, 491 387 can be divided by 13: 491 387 / 13 = 37 799.
For 491 387 to be a prime number, it would have been required that 491 387 has only two divisors, i.e., itself and 1.
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491 387 is an odd number, because it is not evenly divisible by 2.
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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 491 387 is about 700.990.
Thus, the square root of 491 387 is not an integer, and therefore 491 387 is not a square number.
The square of a number (here 491 387) is the result of the product of this number (491 387) by itself (i.e., 491 387 × 491 387); the square of 491 387 is sometimes called "raising 491 387 to the power 2", or "491 387 squared".
The square of 491 387 is 241 461 183 769 because 491 387 × 491 387 = 491 3872 = 241 461 183 769.
As a consequence, 491 387 is the square root of 241 461 183 769.
The multiples of 491 387 are all integers evenly divisible by 491 387, that is all numbers such that the remainder of the division by 491 387 is zero. There are infinitely many multiples of 491 387. The smallest multiples of 491 387 are: