It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 8 408 538 is not a prime number.
For example, 8 408 538 can be divided by 2: 8 408 538 / 2 = 4 204 269.
For 8 408 538 to be a prime number, it would have been required that 8 408 538 has only two divisors, i.e., itself and 1.
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8 408 538 is an even number, because it is evenly divisible by 2: 8 408 538 / 2 = 4 204 269.
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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 8 408 538 is about 2 899.748.
Thus, the square root of 8 408 538 is not an integer, and therefore 8 408 538 is not a square number.
The square of a number (here 8 408 538) is the result of the product of this number (8 408 538) by itself (i.e., 8 408 538 × 8 408 538); the square of 8 408 538 is sometimes called "raising 8 408 538 to the power 2", or "8 408 538 squared".
The square of 8 408 538 is 70 703 511 297 444 because 8 408 538 × 8 408 538 = 8 408 5382 = 70 703 511 297 444.
As a consequence, 8 408 538 is the square root of 70 703 511 297 444.
The multiples of 8 408 538 are all integers evenly divisible by 8 408 538, that is all numbers such that the remainder of the division by 8 408 538 is zero. There are infinitely many multiples of 8 408 538. The smallest multiples of 8 408 538 are: