It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 638 398 is not a prime number.
For example, 638 398 can be divided by 2: 638 398 / 2 = 319 199.
For 638 398 to be a prime number, it would have been required that 638 398 has only two divisors, i.e., itself and 1.
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638 398 is an even number, because it is evenly divisible by 2: 638 398 / 2 = 319 199.
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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 638 398 is about 798.998.
Thus, the square root of 638 398 is not an integer, and therefore 638 398 is not a square number.
The square of a number (here 638 398) is the result of the product of this number (638 398) by itself (i.e., 638 398 × 638 398); the square of 638 398 is sometimes called "raising 638 398 to the power 2", or "638 398 squared".
The square of 638 398 is 407 552 006 404 because 638 398 × 638 398 = 638 3982 = 407 552 006 404.
As a consequence, 638 398 is the square root of 407 552 006 404.
The multiples of 638 398 are all integers evenly divisible by 638 398, that is all numbers such that the remainder of the division by 638 398 is zero. There are infinitely many multiples of 638 398. The smallest multiples of 638 398 are: