It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 398 690 878 is not a prime number.
For example, 398 690 878 can be divided by 2: 398 690 878 / 2 = 199 345 439.
For 398 690 878 to be a prime number, it would have been required that 398 690 878 has only two divisors, i.e., itself and 1.
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398 690 878 is an even number, because it is evenly divisible by 2: 398 690 878 / 2 = 199 345 439.
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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 398 690 878 is about 19 967.245.
Thus, the square root of 398 690 878 is not an integer, and therefore 398 690 878 is not a square number.
The square of a number (here 398 690 878) is the result of the product of this number (398 690 878) by itself (i.e., 398 690 878 × 398 690 878); the square of 398 690 878 is sometimes called "raising 398 690 878 to the power 2", or "398 690 878 squared".
The square of 398 690 878 is 158 954 416 200 410 880 because 398 690 878 × 398 690 878 = 398 690 8782 = 158 954 416 200 410 880.
As a consequence, 398 690 878 is the square root of 158 954 416 200 410 880.
398 690 878 is a number with 9 digits.
The multiples of 398 690 878 are all integers evenly divisible by 398 690 878, that is all numbers such that the remainder of the division by 398 690 878 is zero. There are infinitely many multiples of 398 690 878. The smallest multiples of 398 690 878 are: