It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 20 644 724 is not a prime number.
For example, 20 644 724 can be divided by 2: 20 644 724 / 2 = 10 322 362.
For 20 644 724 to be a prime number, it would have been required that 20 644 724 has only two divisors, i.e., itself and 1.
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20 644 724 is an even number, because it is evenly divisible by 2: 20 644 724 / 2 = 10 322 362.
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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 20 644 724 is about 4 543.647.
Thus, the square root of 20 644 724 is not an integer, and therefore 20 644 724 is not a square number.
The square of a number (here 20 644 724) is the result of the product of this number (20 644 724) by itself (i.e., 20 644 724 × 20 644 724); the square of 20 644 724 is sometimes called "raising 20 644 724 to the power 2", or "20 644 724 squared".
The square of 20 644 724 is 426 204 629 036 176 because 20 644 724 × 20 644 724 = 20 644 7242 = 426 204 629 036 176.
As a consequence, 20 644 724 is the square root of 426 204 629 036 176.
20 644 724 is a number with 8 digits.
The multiples of 20 644 724 are all integers evenly divisible by 20 644 724, that is all numbers such that the remainder of the division by 20 644 724 is zero. There are infinitely many multiples of 20 644 724. The smallest multiples of 20 644 724 are: