It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 20 473 is not a prime number.
For example, 20 473 can be divided by 59: 20 473 / 59 = 347.
For 20 473 to be a prime number, it would have been required that 20 473 has only two divisors, i.e., itself and 1.
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20 473 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 20 473 is about 143.084.
Thus, the square root of 20 473 is not an integer, and therefore 20 473 is not a square number.
The square of a number (here 20 473) is the result of the product of this number (20 473) by itself (i.e., 20 473 × 20 473); the square of 20 473 is sometimes called "raising 20 473 to the power 2", or "20 473 squared".
The square of 20 473 is 419 143 729 because 20 473 × 20 473 = 20 4732 = 419 143 729.
As a consequence, 20 473 is the square root of 419 143 729.
The multiples of 20 473 are all integers evenly divisible by 20 473, that is all numbers such that the remainder of the division by 20 473 is zero. There are infinitely many multiples of 20 473. The smallest multiples of 20 473 are: