It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 638 138 is not a prime number.
For example, 638 138 can be divided by 2: 638 138 / 2 = 319 069.
For 638 138 to be a prime number, it would have been required that 638 138 has only two divisors, i.e., itself and 1.
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638 138 is an even number, because it is evenly divisible by 2: 638 138 / 2 = 319 069.
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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 638 138 is about 798.835.
Thus, the square root of 638 138 is not an integer, and therefore 638 138 is not a square number.
The square of a number (here 638 138) is the result of the product of this number (638 138) by itself (i.e., 638 138 × 638 138); the square of 638 138 is sometimes called "raising 638 138 to the power 2", or "638 138 squared".
The square of 638 138 is 407 220 107 044 because 638 138 × 638 138 = 638 1382 = 407 220 107 044.
As a consequence, 638 138 is the square root of 407 220 107 044.
The multiples of 638 138 are all integers evenly divisible by 638 138, that is all numbers such that the remainder of the division by 638 138 is zero. There are infinitely many multiples of 638 138. The smallest multiples of 638 138 are: