It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 21 267 is not a prime number.
For example, 21 267 can be divided by 3: 21 267 / 3 = 7 089.
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For 21 267 to be a prime number, it would have been required that 21 267 has only two divisors, i.e., itself and 1.
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21 267 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 21 267 is about 145.832.
Thus, the square root of 21 267 is not an integer, and therefore 21 267 is not a square number.
The square of a number (here 21 267) is the result of the product of this number (21 267) by itself (i.e., 21 267 × 21 267); the square of 21 267 is sometimes called "raising 21 267 to the power 2", or "21 267 squared".
The square of 21 267 is 452 285 289 because 21 267 × 21 267 = 21 2672 = 452 285 289.
As a consequence, 21 267 is the square root of 452 285 289.
The multiples of 21 267 are all integers evenly divisible by 21 267, that is all numbers such that the remainder of the division by 21 267 is zero. There are infinitely many multiples of 21 267. The smallest multiples of 21 267 are: