It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 638 775 074 is not a prime number.
For example, 638 775 074 can be divided by 2: 638 775 074 / 2 = 319 387 537.
For 638 775 074 to be a prime number, it would have been required that 638 775 074 has only two divisors, i.e., itself and 1.
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638 775 074 is an even number, because it is evenly divisible by 2: 638 775 074 / 2 = 319 387 537.
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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 638 775 074 is about 25 274.000.
Thus, the square root of 638 775 074 is not an integer, and therefore 638 775 074 is not a square number.
The square of a number (here 638 775 074) is the result of the product of this number (638 775 074) by itself (i.e., 638 775 074 × 638 775 074); the square of 638 775 074 is sometimes called "raising 638 775 074 to the power 2", or "638 775 074 squared".
The square of 638 775 074 is 408 033 595 163 705 472 because 638 775 074 × 638 775 074 = 638 775 0742 = 408 033 595 163 705 472.
As a consequence, 638 775 074 is the square root of 408 033 595 163 705 472.
638 775 074 is a number with 9 digits.
The multiples of 638 775 074 are all integers evenly divisible by 638 775 074, that is all numbers such that the remainder of the division by 638 775 074 is zero. There are infinitely many multiples of 638 775 074. The smallest multiples of 638 775 074 are: