It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 638 242 is not a prime number.
For example, 638 242 can be divided by 2: 638 242 / 2 = 319 121.
For 638 242 to be a prime number, it would have been required that 638 242 has only two divisors, i.e., itself and 1.
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638 242 is an even number, because it is evenly divisible by 2: 638 242 / 2 = 319 121.
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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 638 242 is about 798.900.
Thus, the square root of 638 242 is not an integer, and therefore 638 242 is not a square number.
The square of a number (here 638 242) is the result of the product of this number (638 242) by itself (i.e., 638 242 × 638 242); the square of 638 242 is sometimes called "raising 638 242 to the power 2", or "638 242 squared".
The square of 638 242 is 407 352 850 564 because 638 242 × 638 242 = 638 2422 = 407 352 850 564.
As a consequence, 638 242 is the square root of 407 352 850 564.
The multiples of 638 242 are all integers evenly divisible by 638 242, that is all numbers such that the remainder of the division by 638 242 is zero. There are infinitely many multiples of 638 242. The smallest multiples of 638 242 are: