It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 5 398 491 is not a prime number.
For example, 5 398 491 can be divided by 3: 5 398 491 / 3 = 1 799 497.
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For 5 398 491 to be a prime number, it would have been required that 5 398 491 has only two divisors, i.e., itself and 1.
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5 398 491 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 5 398 491 is about 2 323.465.
Thus, the square root of 5 398 491 is not an integer, and therefore 5 398 491 is not a square number.
The square of a number (here 5 398 491) is the result of the product of this number (5 398 491) by itself (i.e., 5 398 491 × 5 398 491); the square of 5 398 491 is sometimes called "raising 5 398 491 to the power 2", or "5 398 491 squared".
The square of 5 398 491 is 29 143 705 077 081 because 5 398 491 × 5 398 491 = 5 398 4912 = 29 143 705 077 081.
As a consequence, 5 398 491 is the square root of 29 143 705 077 081.
The multiples of 5 398 491 are all integers evenly divisible by 5 398 491, that is all numbers such that the remainder of the division by 5 398 491 is zero. There are infinitely many multiples of 5 398 491. The smallest multiples of 5 398 491 are: