It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 321 204 is not a prime number.
For example, 321 204 can be divided by 2: 321 204 / 2 = 160 602.
For 321 204 to be a prime number, it would have been required that 321 204 has only two divisors, i.e., itself and 1.
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321 204 is an even number, because it is evenly divisible by 2: 321 204 / 2 = 160 602.
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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 321 204 is about 566.749.
Thus, the square root of 321 204 is not an integer, and therefore 321 204 is not a square number.
The square of a number (here 321 204) is the result of the product of this number (321 204) by itself (i.e., 321 204 × 321 204); the square of 321 204 is sometimes called "raising 321 204 to the power 2", or "321 204 squared".
The square of 321 204 is 103 172 009 616 because 321 204 × 321 204 = 321 2042 = 103 172 009 616.
As a consequence, 321 204 is the square root of 103 172 009 616.
The multiples of 321 204 are all integers evenly divisible by 321 204, that is all numbers such that the remainder of the division by 321 204 is zero. There are infinitely many multiples of 321 204. The smallest multiples of 321 204 are: