It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 644 474 is not a prime number.
For example, 644 474 can be divided by 2: 644 474 / 2 = 322 237.
For 644 474 to be a prime number, it would have been required that 644 474 has only two divisors, i.e., itself and 1.
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644 474 is an even number, because it is evenly divisible by 2: 644 474 / 2 = 322 237.
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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 644 474 is about 802.791.
Thus, the square root of 644 474 is not an integer, and therefore 644 474 is not a square number.
The square of a number (here 644 474) is the result of the product of this number (644 474) by itself (i.e., 644 474 × 644 474); the square of 644 474 is sometimes called "raising 644 474 to the power 2", or "644 474 squared".
The square of 644 474 is 415 346 736 676 because 644 474 × 644 474 = 644 4742 = 415 346 736 676.
As a consequence, 644 474 is the square root of 415 346 736 676.
The multiples of 644 474 are all integers evenly divisible by 644 474, that is all numbers such that the remainder of the division by 644 474 is zero. There are infinitely many multiples of 644 474. The smallest multiples of 644 474 are: