It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 644 218 is not a prime number.
For example, 644 218 can be divided by 2: 644 218 / 2 = 322 109.
For 644 218 to be a prime number, it would have been required that 644 218 has only two divisors, i.e., itself and 1.
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644 218 is an even number, because it is evenly divisible by 2: 644 218 / 2 = 322 109.
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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 644 218 is about 802.632.
Thus, the square root of 644 218 is not an integer, and therefore 644 218 is not a square number.
The square of a number (here 644 218) is the result of the product of this number (644 218) by itself (i.e., 644 218 × 644 218); the square of 644 218 is sometimes called "raising 644 218 to the power 2", or "644 218 squared".
The square of 644 218 is 415 016 831 524 because 644 218 × 644 218 = 644 2182 = 415 016 831 524.
As a consequence, 644 218 is the square root of 415 016 831 524.
The multiples of 644 218 are all integers evenly divisible by 644 218, that is all numbers such that the remainder of the division by 644 218 is zero. There are infinitely many multiples of 644 218. The smallest multiples of 644 218 are: