It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 398 421 is not a prime number.
For example, 398 421 can be divided by 3: 398 421 / 3 = 132 807.
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For 398 421 to be a prime number, it would have been required that 398 421 has only two divisors, i.e., itself and 1.
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398 421 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 398 421 is about 631.206.
Thus, the square root of 398 421 is not an integer, and therefore 398 421 is not a square number.
The square of a number (here 398 421) is the result of the product of this number (398 421) by itself (i.e., 398 421 × 398 421); the square of 398 421 is sometimes called "raising 398 421 to the power 2", or "398 421 squared".
The square of 398 421 is 158 739 293 241 because 398 421 × 398 421 = 398 4212 = 158 739 293 241.
As a consequence, 398 421 is the square root of 158 739 293 241.
The multiples of 398 421 are all integers evenly divisible by 398 421, that is all numbers such that the remainder of the division by 398 421 is zero. There are infinitely many multiples of 398 421. The smallest multiples of 398 421 are: