It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 5 428 898 is not a prime number.
For example, 5 428 898 can be divided by 2: 5 428 898 / 2 = 2 714 449.
For 5 428 898 to be a prime number, it would have been required that 5 428 898 has only two divisors, i.e., itself and 1.
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5 428 898 is an even number, because it is evenly divisible by 2: 5 428 898 / 2 = 2 714 449.
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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 5 428 898 is about 2 330.000.
Thus, the square root of 5 428 898 is not an integer, and therefore 5 428 898 is not a square number.
The square of a number (here 5 428 898) is the result of the product of this number (5 428 898) by itself (i.e., 5 428 898 × 5 428 898); the square of 5 428 898 is sometimes called "raising 5 428 898 to the power 2", or "5 428 898 squared".
The square of 5 428 898 is 29 472 933 494 404 because 5 428 898 × 5 428 898 = 5 428 8982 = 29 472 933 494 404.
As a consequence, 5 428 898 is the square root of 29 472 933 494 404.
The multiples of 5 428 898 are all integers evenly divisible by 5 428 898, that is all numbers such that the remainder of the division by 5 428 898 is zero. There are infinitely many multiples of 5 428 898. The smallest multiples of 5 428 898 are: