It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 644 674 is not a prime number.
For example, 644 674 can be divided by 2: 644 674 / 2 = 322 337.
For 644 674 to be a prime number, it would have been required that 644 674 has only two divisors, i.e., itself and 1.
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644 674 is an even number, because it is evenly divisible by 2: 644 674 / 2 = 322 337.
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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 644 674 is about 802.916.
Thus, the square root of 644 674 is not an integer, and therefore 644 674 is not a square number.
The square of a number (here 644 674) is the result of the product of this number (644 674) by itself (i.e., 644 674 × 644 674); the square of 644 674 is sometimes called "raising 644 674 to the power 2", or "644 674 squared".
The square of 644 674 is 415 604 566 276 because 644 674 × 644 674 = 644 6742 = 415 604 566 276.
As a consequence, 644 674 is the square root of 415 604 566 276.
The multiples of 644 674 are all integers evenly divisible by 644 674, that is all numbers such that the remainder of the division by 644 674 is zero. There are infinitely many multiples of 644 674. The smallest multiples of 644 674 are: