It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 8 648 374 is not a prime number.
For example, 8 648 374 can be divided by 2: 8 648 374 / 2 = 4 324 187.
For 8 648 374 to be a prime number, it would have been required that 8 648 374 has only two divisors, i.e., itself and 1.
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8 648 374 is an even number, because it is evenly divisible by 2: 8 648 374 / 2 = 4 324 187.
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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 8 648 374 is about 2 940.812.
Thus, the square root of 8 648 374 is not an integer, and therefore 8 648 374 is not a square number.
The square of a number (here 8 648 374) is the result of the product of this number (8 648 374) by itself (i.e., 8 648 374 × 8 648 374); the square of 8 648 374 is sometimes called "raising 8 648 374 to the power 2", or "8 648 374 squared".
The square of 8 648 374 is 74 794 372 843 876 because 8 648 374 × 8 648 374 = 8 648 3742 = 74 794 372 843 876.
As a consequence, 8 648 374 is the square root of 74 794 372 843 876.
The multiples of 8 648 374 are all integers evenly divisible by 8 648 374, that is all numbers such that the remainder of the division by 8 648 374 is zero. There are infinitely many multiples of 8 648 374. The smallest multiples of 8 648 374 are: