It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 8 638 716 is not a prime number.
For example, 8 638 716 can be divided by 2: 8 638 716 / 2 = 4 319 358.
For 8 638 716 to be a prime number, it would have been required that 8 638 716 has only two divisors, i.e., itself and 1.
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8 638 716 is an even number, because it is evenly divisible by 2: 8 638 716 / 2 = 4 319 358.
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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 8 638 716 is about 2 939.169.
Thus, the square root of 8 638 716 is not an integer, and therefore 8 638 716 is not a square number.
The square of a number (here 8 638 716) is the result of the product of this number (8 638 716) by itself (i.e., 8 638 716 × 8 638 716); the square of 8 638 716 is sometimes called "raising 8 638 716 to the power 2", or "8 638 716 squared".
The square of 8 638 716 is 74 627 414 128 656 because 8 638 716 × 8 638 716 = 8 638 7162 = 74 627 414 128 656.
As a consequence, 8 638 716 is the square root of 74 627 414 128 656.
The multiples of 8 638 716 are all integers evenly divisible by 8 638 716, that is all numbers such that the remainder of the division by 8 638 716 is zero. There are infinitely many multiples of 8 638 716. The smallest multiples of 8 638 716 are: