It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 21 697 is not a prime number.
For example, 21 697 can be divided by 13: 21 697 / 13 = 1 669.
For 21 697 to be a prime number, it would have been required that 21 697 has only two divisors, i.e., itself and 1.
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21 697 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 21 697 is about 147.299.
Thus, the square root of 21 697 is not an integer, and therefore 21 697 is not a square number.
The square of a number (here 21 697) is the result of the product of this number (21 697) by itself (i.e., 21 697 × 21 697); the square of 21 697 is sometimes called "raising 21 697 to the power 2", or "21 697 squared".
The square of 21 697 is 470 759 809 because 21 697 × 21 697 = 21 6972 = 470 759 809.
As a consequence, 21 697 is the square root of 470 759 809.
The multiples of 21 697 are all integers evenly divisible by 21 697, that is all numbers such that the remainder of the division by 21 697 is zero. There are infinitely many multiples of 21 697. The smallest multiples of 21 697 are: