It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 67 542 is not a prime number.
For example, 67 542 can be divided by 2: 67 542 / 2 = 33 771.
For 67 542 to be a prime number, it would have been required that 67 542 has only two divisors, i.e., itself and 1.
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67 542 is an even number, because it is evenly divisible by 2: 67 542 / 2 = 33 771.
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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 67 542 is about 259.888.
Thus, the square root of 67 542 is not an integer, and therefore 67 542 is not a square number.
The square of a number (here 67 542) is the result of the product of this number (67 542) by itself (i.e., 67 542 × 67 542); the square of 67 542 is sometimes called "raising 67 542 to the power 2", or "67 542 squared".
The square of 67 542 is 4 561 921 764 because 67 542 × 67 542 = 67 5422 = 4 561 921 764.
As a consequence, 67 542 is the square root of 4 561 921 764.
The multiples of 67 542 are all integers evenly divisible by 67 542, that is all numbers such that the remainder of the division by 67 542 is zero. There are infinitely many multiples of 67 542. The smallest multiples of 67 542 are: