It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 102 021 is not a prime number.
For example, 102 021 can be divided by 3: 102 021 / 3 = 34 007.
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For 102 021 to be a prime number, it would have been required that 102 021 has only two divisors, i.e., itself and 1.
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102 021 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 102 021 is about 319.407.
Thus, the square root of 102 021 is not an integer, and therefore 102 021 is not a square number.
The square of a number (here 102 021) is the result of the product of this number (102 021) by itself (i.e., 102 021 × 102 021); the square of 102 021 is sometimes called "raising 102 021 to the power 2", or "102 021 squared".
The square of 102 021 is 10 408 284 441 because 102 021 × 102 021 = 102 0212 = 10 408 284 441.
As a consequence, 102 021 is the square root of 10 408 284 441.
The multiples of 102 021 are all integers evenly divisible by 102 021, that is all numbers such that the remainder of the division by 102 021 is zero. There are infinitely many multiples of 102 021. The smallest multiples of 102 021 are: