Only integers (whole numbers) can be primes.
A prime is a number that is only divisible by 1 and itself.
43.2 and all other decimal numbers are not divisible by 1.
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Composite (the only even number that is prime is2).
343 and 432 are relatively prime to each other.
2 x 2 x 2 x 2 x 3 x 3 x 3 = 432
Composite
432 = 2, 3 522 = 2, 3, 29