It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 638 397 is not a prime number.
For example, 638 397 can be divided by 3: 638 397 / 3 = 212 799.
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For 638 397 to be a prime number, it would have been required that 638 397 has only two divisors, i.e., itself and 1.
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638 397 is an odd number, because it is not evenly divisible by 2.
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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 638 397 is about 798.997.
Thus, the square root of 638 397 is not an integer, and therefore 638 397 is not a square number.
The square of a number (here 638 397) is the result of the product of this number (638 397) by itself (i.e., 638 397 × 638 397); the square of 638 397 is sometimes called "raising 638 397 to the power 2", or "638 397 squared".
The square of 638 397 is 407 550 729 609 because 638 397 × 638 397 = 638 3972 = 407 550 729 609.
As a consequence, 638 397 is the square root of 407 550 729 609.
The multiples of 638 397 are all integers evenly divisible by 638 397, that is all numbers such that the remainder of the division by 638 397 is zero. There are infinitely many multiples of 638 397. The smallest multiples of 638 397 are: