It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 321 338 is not a prime number.
For example, 321 338 can be divided by 2: 321 338 / 2 = 160 669.
For 321 338 to be a prime number, it would have been required that 321 338 has only two divisors, i.e., itself and 1.
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321 338 is an even number, because it is evenly divisible by 2: 321 338 / 2 = 160 669.
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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 321 338 is about 566.867.
Thus, the square root of 321 338 is not an integer, and therefore 321 338 is not a square number.
The square of a number (here 321 338) is the result of the product of this number (321 338) by itself (i.e., 321 338 × 321 338); the square of 321 338 is sometimes called "raising 321 338 to the power 2", or "321 338 squared".
The square of 321 338 is 103 258 110 244 because 321 338 × 321 338 = 321 3382 = 103 258 110 244.
As a consequence, 321 338 is the square root of 103 258 110 244.
The multiples of 321 338 are all integers evenly divisible by 321 338, that is all numbers such that the remainder of the division by 321 338 is zero. There are infinitely many multiples of 321 338. The smallest multiples of 321 338 are: