It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 21 497 is not a prime number.
For example, 21 497 can be divided by 7: 21 497 / 7 = 3 071.
For 21 497 to be a prime number, it would have been required that 21 497 has only two divisors, i.e., itself and 1.
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21 497 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 21 497 is about 146.619.
Thus, the square root of 21 497 is not an integer, and therefore 21 497 is not a square number.
The square of a number (here 21 497) is the result of the product of this number (21 497) by itself (i.e., 21 497 × 21 497); the square of 21 497 is sometimes called "raising 21 497 to the power 2", or "21 497 squared".
The square of 21 497 is 462 121 009 because 21 497 × 21 497 = 21 4972 = 462 121 009.
As a consequence, 21 497 is the square root of 462 121 009.
The multiples of 21 497 are all integers evenly divisible by 21 497, that is all numbers such that the remainder of the division by 21 497 is zero. There are infinitely many multiples of 21 497. The smallest multiples of 21 497 are: