It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 644 342 is not a prime number.
For example, 644 342 can be divided by 2: 644 342 / 2 = 322 171.
For 644 342 to be a prime number, it would have been required that 644 342 has only two divisors, i.e., itself and 1.
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644 342 is an even number, because it is evenly divisible by 2: 644 342 / 2 = 322 171.
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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 644 342 is about 802.709.
Thus, the square root of 644 342 is not an integer, and therefore 644 342 is not a square number.
The square of a number (here 644 342) is the result of the product of this number (644 342) by itself (i.e., 644 342 × 644 342); the square of 644 342 is sometimes called "raising 644 342 to the power 2", or "644 342 squared".
The square of 644 342 is 415 176 612 964 because 644 342 × 644 342 = 644 3422 = 415 176 612 964.
As a consequence, 644 342 is the square root of 415 176 612 964.
The multiples of 644 342 are all integers evenly divisible by 644 342, that is all numbers such that the remainder of the division by 644 342 is zero. There are infinitely many multiples of 644 342. The smallest multiples of 644 342 are: