It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 638 704 is not a prime number.
For example, 638 704 can be divided by 2: 638 704 / 2 = 319 352.
For 638 704 to be a prime number, it would have been required that 638 704 has only two divisors, i.e., itself and 1.
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638 704 is an even number, because it is evenly divisible by 2: 638 704 / 2 = 319 352.
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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 638 704 is about 799.190.
Thus, the square root of 638 704 is not an integer, and therefore 638 704 is not a square number.
The square of a number (here 638 704) is the result of the product of this number (638 704) by itself (i.e., 638 704 × 638 704); the square of 638 704 is sometimes called "raising 638 704 to the power 2", or "638 704 squared".
The square of 638 704 is 407 942 799 616 because 638 704 × 638 704 = 638 7042 = 407 942 799 616.
As a consequence, 638 704 is the square root of 407 942 799 616.
The multiples of 638 704 are all integers evenly divisible by 638 704, that is all numbers such that the remainder of the division by 638 704 is zero. There are infinitely many multiples of 638 704. The smallest multiples of 638 704 are: