It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 638 518 is not a prime number.
For example, 638 518 can be divided by 2: 638 518 / 2 = 319 259.
For 638 518 to be a prime number, it would have been required that 638 518 has only two divisors, i.e., itself and 1.
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638 518 is an even number, because it is evenly divisible by 2: 638 518 / 2 = 319 259.
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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 638 518 is about 799.073.
Thus, the square root of 638 518 is not an integer, and therefore 638 518 is not a square number.
The square of a number (here 638 518) is the result of the product of this number (638 518) by itself (i.e., 638 518 × 638 518); the square of 638 518 is sometimes called "raising 638 518 to the power 2", or "638 518 squared".
The square of 638 518 is 407 705 236 324 because 638 518 × 638 518 = 638 5182 = 407 705 236 324.
As a consequence, 638 518 is the square root of 407 705 236 324.
The multiples of 638 518 are all integers evenly divisible by 638 518, that is all numbers such that the remainder of the division by 638 518 is zero. There are infinitely many multiples of 638 518. The smallest multiples of 638 518 are: