It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 67 424 is not a prime number.
For example, 67 424 can be divided by 2: 67 424 / 2 = 33 712.
For 67 424 to be a prime number, it would have been required that 67 424 has only two divisors, i.e., itself and 1.
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67 424 is an even number, because it is evenly divisible by 2: 67 424 / 2 = 33 712.
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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 67 424 is about 259.661.
Thus, the square root of 67 424 is not an integer, and therefore 67 424 is not a square number.
The square of a number (here 67 424) is the result of the product of this number (67 424) by itself (i.e., 67 424 × 67 424); the square of 67 424 is sometimes called "raising 67 424 to the power 2", or "67 424 squared".
The square of 67 424 is 4 545 995 776 because 67 424 × 67 424 = 67 4242 = 4 545 995 776.
As a consequence, 67 424 is the square root of 4 545 995 776.
The multiples of 67 424 are all integers evenly divisible by 67 424, that is all numbers such that the remainder of the division by 67 424 is zero. There are infinitely many multiples of 67 424. The smallest multiples of 67 424 are: