It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 21 179 021 is not a prime number.
For example, 21 179 021 can be divided by 23: 21 179 021 / 23 = 920 827.
For 21 179 021 to be a prime number, it would have been required that 21 179 021 has only two divisors, i.e., itself and 1.
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21 179 021 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 21 179 021 is about 4 602.067.
Thus, the square root of 21 179 021 is not an integer, and therefore 21 179 021 is not a square number.
The square of a number (here 21 179 021) is the result of the product of this number (21 179 021) by itself (i.e., 21 179 021 × 21 179 021); the square of 21 179 021 is sometimes called "raising 21 179 021 to the power 2", or "21 179 021 squared".
The square of 21 179 021 is 448 550 930 518 441 because 21 179 021 × 21 179 021 = 21 179 0212 = 448 550 930 518 441.
As a consequence, 21 179 021 is the square root of 448 550 930 518 441.
21 179 021 is a number with 8 digits.
The multiples of 21 179 021 are all integers evenly divisible by 21 179 021, that is all numbers such that the remainder of the division by 21 179 021 is zero. There are infinitely many multiples of 21 179 021. The smallest multiples of 21 179 021 are: