It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 8 538 428 is not a prime number.
For example, 8 538 428 can be divided by 2: 8 538 428 / 2 = 4 269 214.
For 8 538 428 to be a prime number, it would have been required that 8 538 428 has only two divisors, i.e., itself and 1.
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8 538 428 is an even number, because it is evenly divisible by 2: 8 538 428 / 2 = 4 269 214.
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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 8 538 428 is about 2 922.059.
Thus, the square root of 8 538 428 is not an integer, and therefore 8 538 428 is not a square number.
The square of a number (here 8 538 428) is the result of the product of this number (8 538 428) by itself (i.e., 8 538 428 × 8 538 428); the square of 8 538 428 is sometimes called "raising 8 538 428 to the power 2", or "8 538 428 squared".
The square of 8 538 428 is 72 904 752 711 184 because 8 538 428 × 8 538 428 = 8 538 4282 = 72 904 752 711 184.
As a consequence, 8 538 428 is the square root of 72 904 752 711 184.
The multiples of 8 538 428 are all integers evenly divisible by 8 538 428, that is all numbers such that the remainder of the division by 8 538 428 is zero. There are infinitely many multiples of 8 538 428. The smallest multiples of 8 538 428 are: