It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 644 604 is not a prime number.
For example, 644 604 can be divided by 2: 644 604 / 2 = 322 302.
For 644 604 to be a prime number, it would have been required that 644 604 has only two divisors, i.e., itself and 1.
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644 604 is an even number, because it is evenly divisible by 2: 644 604 / 2 = 322 302.
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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 644 604 is about 802.872.
Thus, the square root of 644 604 is not an integer, and therefore 644 604 is not a square number.
The square of a number (here 644 604) is the result of the product of this number (644 604) by itself (i.e., 644 604 × 644 604); the square of 644 604 is sometimes called "raising 644 604 to the power 2", or "644 604 squared".
The square of 644 604 is 415 514 316 816 because 644 604 × 644 604 = 644 6042 = 415 514 316 816.
As a consequence, 644 604 is the square root of 415 514 316 816.
The multiples of 644 604 are all integers evenly divisible by 644 604, that is all numbers such that the remainder of the division by 644 604 is zero. There are infinitely many multiples of 644 604. The smallest multiples of 644 604 are: