It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 400 204 is not a prime number.
For example, 400 204 can be divided by 2: 400 204 / 2 = 200 102.
For 400 204 to be a prime number, it would have been required that 400 204 has only two divisors, i.e., itself and 1.
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400 204 is an even number, because it is evenly divisible by 2: 400 204 / 2 = 200 102.
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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 400 204 is about 632.617.
Thus, the square root of 400 204 is not an integer, and therefore 400 204 is not a square number.
The square of a number (here 400 204) is the result of the product of this number (400 204) by itself (i.e., 400 204 × 400 204); the square of 400 204 is sometimes called "raising 400 204 to the power 2", or "400 204 squared".
The square of 400 204 is 160 163 241 616 because 400 204 × 400 204 = 400 2042 = 160 163 241 616.
As a consequence, 400 204 is the square root of 160 163 241 616.
The multiples of 400 204 are all integers evenly divisible by 400 204, that is all numbers such that the remainder of the division by 400 204 is zero. There are infinitely many multiples of 400 204. The smallest multiples of 400 204 are: