It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 20 702 is not a prime number.
For example, 20 702 can be divided by 2: 20 702 / 2 = 10 351.
For 20 702 to be a prime number, it would have been required that 20 702 has only two divisors, i.e., itself and 1.
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20 702 is an even number, because it is evenly divisible by 2: 20 702 / 2 = 10 351.
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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 20 702 is about 143.882.
Thus, the square root of 20 702 is not an integer, and therefore 20 702 is not a square number.
The square of a number (here 20 702) is the result of the product of this number (20 702) by itself (i.e., 20 702 × 20 702); the square of 20 702 is sometimes called "raising 20 702 to the power 2", or "20 702 squared".
The square of 20 702 is 428 572 804 because 20 702 × 20 702 = 20 7022 = 428 572 804.
As a consequence, 20 702 is the square root of 428 572 804.
The multiples of 20 702 are all integers evenly divisible by 20 702, that is all numbers such that the remainder of the division by 20 702 is zero. There are infinitely many multiples of 20 702. The smallest multiples of 20 702 are: