It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 5 398 236 is not a prime number.
For example, 5 398 236 can be divided by 2: 5 398 236 / 2 = 2 699 118.
For 5 398 236 to be a prime number, it would have been required that 5 398 236 has only two divisors, i.e., itself and 1.
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5 398 236 is an even number, because it is evenly divisible by 2: 5 398 236 / 2 = 2 699 118.
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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 5 398 236 is about 2 323.410.
Thus, the square root of 5 398 236 is not an integer, and therefore 5 398 236 is not a square number.
The square of a number (here 5 398 236) is the result of the product of this number (5 398 236) by itself (i.e., 5 398 236 × 5 398 236); the square of 5 398 236 is sometimes called "raising 5 398 236 to the power 2", or "5 398 236 squared".
The square of 5 398 236 is 29 140 951 911 696 because 5 398 236 × 5 398 236 = 5 398 2362 = 29 140 951 911 696.
As a consequence, 5 398 236 is the square root of 29 140 951 911 696.
The multiples of 5 398 236 are all integers evenly divisible by 5 398 236, that is all numbers such that the remainder of the division by 5 398 236 is zero. There are infinitely many multiples of 5 398 236. The smallest multiples of 5 398 236 are: