It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 198 438 409 is not a prime number.
For example, 198 438 409 can be divided by 13: 198 438 409 / 13 = 15 264 493.
For 198 438 409 to be a prime number, it would have been required that 198 438 409 has only two divisors, i.e., itself and 1.
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198 438 409 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 198 438 409 is about 14 086.817.
Thus, the square root of 198 438 409 is not an integer, and therefore 198 438 409 is not a square number.
The square of a number (here 198 438 409) is the result of the product of this number (198 438 409) by itself (i.e., 198 438 409 × 198 438 409); the square of 198 438 409 is sometimes called "raising 198 438 409 to the power 2", or "198 438 409 squared".
The square of 198 438 409 is 39 377 802 166 451 280 because 198 438 409 × 198 438 409 = 198 438 4092 = 39 377 802 166 451 280.
As a consequence, 198 438 409 is the square root of 39 377 802 166 451 280.
198 438 409 is a number with 9 digits.
The multiples of 198 438 409 are all integers evenly divisible by 198 438 409, that is all numbers such that the remainder of the division by 198 438 409 is zero. There are infinitely many multiples of 198 438 409. The smallest multiples of 198 438 409 are: