It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 398 442 is not a prime number.
For example, 398 442 can be divided by 2: 398 442 / 2 = 199 221.
For 398 442 to be a prime number, it would have been required that 398 442 has only two divisors, i.e., itself and 1.
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398 442 is an even number, because it is evenly divisible by 2: 398 442 / 2 = 199 221.
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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 398 442 is about 631.223.
Thus, the square root of 398 442 is not an integer, and therefore 398 442 is not a square number.
The square of a number (here 398 442) is the result of the product of this number (398 442) by itself (i.e., 398 442 × 398 442); the square of 398 442 is sometimes called "raising 398 442 to the power 2", or "398 442 squared".
The square of 398 442 is 158 756 027 364 because 398 442 × 398 442 = 398 4422 = 158 756 027 364.
As a consequence, 398 442 is the square root of 158 756 027 364.
The multiples of 398 442 are all integers evenly divisible by 398 442, that is all numbers such that the remainder of the division by 398 442 is zero. There are infinitely many multiples of 398 442. The smallest multiples of 398 442 are: