It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 21 201 is not a prime number.
For example, 21 201 can be divided by 3: 21 201 / 3 = 7 067.
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For 21 201 to be a prime number, it would have been required that 21 201 has only two divisors, i.e., itself and 1.
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21 201 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 21 201 is about 145.606.
Thus, the square root of 21 201 is not an integer, and therefore 21 201 is not a square number.
The square of a number (here 21 201) is the result of the product of this number (21 201) by itself (i.e., 21 201 × 21 201); the square of 21 201 is sometimes called "raising 21 201 to the power 2", or "21 201 squared".
The square of 21 201 is 449 482 401 because 21 201 × 21 201 = 21 2012 = 449 482 401.
As a consequence, 21 201 is the square root of 449 482 401.
The multiples of 21 201 are all integers evenly divisible by 21 201, that is all numbers such that the remainder of the division by 21 201 is zero. There are infinitely many multiples of 21 201. The smallest multiples of 21 201 are: