It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 21 829 is not a prime number.
For example, 21 829 can be divided by 83: 21 829 / 83 = 263.
For 21 829 to be a prime number, it would have been required that 21 829 has only two divisors, i.e., itself and 1.
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21 829 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 21 829 is about 147.746.
Thus, the square root of 21 829 is not an integer, and therefore 21 829 is not a square number.
The square of a number (here 21 829) is the result of the product of this number (21 829) by itself (i.e., 21 829 × 21 829); the square of 21 829 is sometimes called "raising 21 829 to the power 2", or "21 829 squared".
The square of 21 829 is 476 505 241 because 21 829 × 21 829 = 21 8292 = 476 505 241.
As a consequence, 21 829 is the square root of 476 505 241.
The multiples of 21 829 are all integers evenly divisible by 21 829, that is all numbers such that the remainder of the division by 21 829 is zero. There are infinitely many multiples of 21 829. The smallest multiples of 21 829 are: