It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 491 989 is not a prime number.
For example, 491 989 can be divided by 37: 491 989 / 37 = 13 297.
For 491 989 to be a prime number, it would have been required that 491 989 has only two divisors, i.e., itself and 1.
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491 989 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 491 989 is about 701.419.
Thus, the square root of 491 989 is not an integer, and therefore 491 989 is not a square number.
The square of a number (here 491 989) is the result of the product of this number (491 989) by itself (i.e., 491 989 × 491 989); the square of 491 989 is sometimes called "raising 491 989 to the power 2", or "491 989 squared".
The square of 491 989 is 242 053 176 121 because 491 989 × 491 989 = 491 9892 = 242 053 176 121.
As a consequence, 491 989 is the square root of 242 053 176 121.
The multiples of 491 989 are all integers evenly divisible by 491 989, that is all numbers such that the remainder of the division by 491 989 is zero. There are infinitely many multiples of 491 989. The smallest multiples of 491 989 are: