It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 21 473 is not a prime number.
For example, 21 473 can be divided by 109: 21 473 / 109 = 197.
For 21 473 to be a prime number, it would have been required that 21 473 has only two divisors, i.e., itself and 1.
Find out more:
21 473 is an odd number, because it is not evenly divisible by 2.
Find out more:
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 21 473 is about 146.537.
Thus, the square root of 21 473 is not an integer, and therefore 21 473 is not a square number.
The square of a number (here 21 473) is the result of the product of this number (21 473) by itself (i.e., 21 473 × 21 473); the square of 21 473 is sometimes called "raising 21 473 to the power 2", or "21 473 squared".
The square of 21 473 is 461 089 729 because 21 473 × 21 473 = 21 4732 = 461 089 729.
As a consequence, 21 473 is the square root of 461 089 729.
The multiples of 21 473 are all integers evenly divisible by 21 473, that is all numbers such that the remainder of the division by 21 473 is zero. There are infinitely many multiples of 21 473. The smallest multiples of 21 473 are: