It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 644 024 is not a prime number.
For example, 644 024 can be divided by 2: 644 024 / 2 = 322 012.
For 644 024 to be a prime number, it would have been required that 644 024 has only two divisors, i.e., itself and 1.
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644 024 is an even number, because it is evenly divisible by 2: 644 024 / 2 = 322 012.
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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 644 024 is about 802.511.
Thus, the square root of 644 024 is not an integer, and therefore 644 024 is not a square number.
The square of a number (here 644 024) is the result of the product of this number (644 024) by itself (i.e., 644 024 × 644 024); the square of 644 024 is sometimes called "raising 644 024 to the power 2", or "644 024 squared".
The square of 644 024 is 414 766 912 576 because 644 024 × 644 024 = 644 0242 = 414 766 912 576.
As a consequence, 644 024 is the square root of 414 766 912 576.
The multiples of 644 024 are all integers evenly divisible by 644 024, that is all numbers such that the remainder of the division by 644 024 is zero. There are infinitely many multiples of 644 024. The smallest multiples of 644 024 are: