It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 8 138 704 is not a prime number.
For example, 8 138 704 can be divided by 2: 8 138 704 / 2 = 4 069 352.
For 8 138 704 to be a prime number, it would have been required that 8 138 704 has only two divisors, i.e., itself and 1.
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8 138 704 is an even number, because it is evenly divisible by 2: 8 138 704 / 2 = 4 069 352.
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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 8 138 704 is about 2 852.841.
Thus, the square root of 8 138 704 is not an integer, and therefore 8 138 704 is not a square number.
The square of a number (here 8 138 704) is the result of the product of this number (8 138 704) by itself (i.e., 8 138 704 × 8 138 704); the square of 8 138 704 is sometimes called "raising 8 138 704 to the power 2", or "8 138 704 squared".
The square of 8 138 704 is 66 238 502 799 616 because 8 138 704 × 8 138 704 = 8 138 7042 = 66 238 502 799 616.
As a consequence, 8 138 704 is the square root of 66 238 502 799 616.
The multiples of 8 138 704 are all integers evenly divisible by 8 138 704, that is all numbers such that the remainder of the division by 8 138 704 is zero. There are infinitely many multiples of 8 138 704. The smallest multiples of 8 138 704 are: