It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 21 698 is not a prime number.
For example, 21 698 can be divided by 2: 21 698 / 2 = 10 849.
For 21 698 to be a prime number, it would have been required that 21 698 has only two divisors, i.e., itself and 1.
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21 698 is an even number, because it is evenly divisible by 2: 21 698 / 2 = 10 849.
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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 21 698 is about 147.302.
Thus, the square root of 21 698 is not an integer, and therefore 21 698 is not a square number.
The square of a number (here 21 698) is the result of the product of this number (21 698) by itself (i.e., 21 698 × 21 698); the square of 21 698 is sometimes called "raising 21 698 to the power 2", or "21 698 squared".
The square of 21 698 is 470 803 204 because 21 698 × 21 698 = 21 6982 = 470 803 204.
As a consequence, 21 698 is the square root of 470 803 204.
The multiples of 21 698 are all integers evenly divisible by 21 698, that is all numbers such that the remainder of the division by 21 698 is zero. There are infinitely many multiples of 21 698. The smallest multiples of 21 698 are: