It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 644 498 is not a prime number.
For example, 644 498 can be divided by 2: 644 498 / 2 = 322 249.
For 644 498 to be a prime number, it would have been required that 644 498 has only two divisors, i.e., itself and 1.
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644 498 is an even number, because it is evenly divisible by 2: 644 498 / 2 = 322 249.
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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 644 498 is about 802.806.
Thus, the square root of 644 498 is not an integer, and therefore 644 498 is not a square number.
The square of a number (here 644 498) is the result of the product of this number (644 498) by itself (i.e., 644 498 × 644 498); the square of 644 498 is sometimes called "raising 644 498 to the power 2", or "644 498 squared".
The square of 644 498 is 415 377 672 004 because 644 498 × 644 498 = 644 4982 = 415 377 672 004.
As a consequence, 644 498 is the square root of 415 377 672 004.
The multiples of 644 498 are all integers evenly divisible by 644 498, that is all numbers such that the remainder of the division by 644 498 is zero. There are infinitely many multiples of 644 498. The smallest multiples of 644 498 are: