It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 21 342 is not a prime number.
For example, 21 342 can be divided by 2: 21 342 / 2 = 10 671.
For 21 342 to be a prime number, it would have been required that 21 342 has only two divisors, i.e., itself and 1.
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21 342 is an even number, because it is evenly divisible by 2: 21 342 / 2 = 10 671.
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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 21 342 is about 146.089.
Thus, the square root of 21 342 is not an integer, and therefore 21 342 is not a square number.
The square of a number (here 21 342) is the result of the product of this number (21 342) by itself (i.e., 21 342 × 21 342); the square of 21 342 is sometimes called "raising 21 342 to the power 2", or "21 342 squared".
The square of 21 342 is 455 480 964 because 21 342 × 21 342 = 21 3422 = 455 480 964.
As a consequence, 21 342 is the square root of 455 480 964.
The multiples of 21 342 are all integers evenly divisible by 21 342, that is all numbers such that the remainder of the division by 21 342 is zero. There are infinitely many multiples of 21 342. The smallest multiples of 21 342 are: