It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 40 491 is not a prime number.
For example, 40 491 can be divided by 3: 40 491 / 3 = 13 497.
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For 40 491 to be a prime number, it would have been required that 40 491 has only two divisors, i.e., itself and 1.
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40 491 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 40 491 is about 201.224.
Thus, the square root of 40 491 is not an integer, and therefore 40 491 is not a square number.
The square of a number (here 40 491) is the result of the product of this number (40 491) by itself (i.e., 40 491 × 40 491); the square of 40 491 is sometimes called "raising 40 491 to the power 2", or "40 491 squared".
The square of 40 491 is 1 639 521 081 because 40 491 × 40 491 = 40 4912 = 1 639 521 081.
As a consequence, 40 491 is the square root of 1 639 521 081.
The multiples of 40 491 are all integers evenly divisible by 40 491, that is all numbers such that the remainder of the division by 40 491 is zero. There are infinitely many multiples of 40 491. The smallest multiples of 40 491 are: