It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 21 301 is not a prime number.
For example, 21 301 can be divided by 7: 21 301 / 7 = 3 043.
For 21 301 to be a prime number, it would have been required that 21 301 has only two divisors, i.e., itself and 1.
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21 301 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 21 301 is about 145.949.
Thus, the square root of 21 301 is not an integer, and therefore 21 301 is not a square number.
The square of a number (here 21 301) is the result of the product of this number (21 301) by itself (i.e., 21 301 × 21 301); the square of 21 301 is sometimes called "raising 21 301 to the power 2", or "21 301 squared".
The square of 21 301 is 453 732 601 because 21 301 × 21 301 = 21 3012 = 453 732 601.
As a consequence, 21 301 is the square root of 453 732 601.
The multiples of 21 301 are all integers evenly divisible by 21 301, that is all numbers such that the remainder of the division by 21 301 is zero. There are infinitely many multiples of 21 301. The smallest multiples of 21 301 are: