Is a p-value of .047 statistically significant? I ran a Kruskal-Wallis H test and the result was .000. So, I ran a post hoc pairwise comparison to see where the difference precisely exists, and one of the results was a p-value of .047. SPSS did not highlight it in yellow like the other significant results.
Should I report it as a statistically significant or insignificant different?

Given that a p value of .047 is more precise than .05, it is safe to say that your value is significant (if you set a cutoff of $a = .05$ before your analysis at least). Even if it rounds up to .05, .047 is still factually less than the cutoff. Therefore, you may reject the null hypothesis for your pairwise comparisons. Keep in mind, as Frank Harrell suggested in the comments, that these cutoffs are arbitrary and that it is important to obtain more information to understand the actual difference in pairwise comparisons, such as effect sizes like Cohen's d, confidence intervals, or other relevant information that may explain things such as the magnitude of the effect or precision in your estimate.
If your concern is writing up a manuscript, you can do what others have suggested and write out the p value explicitly whenever explaining your results in a paper. The exception to that rule may be some absurdly low p value that requires a lot of scientific notation, where you would instead just use p < .001 for simplification.
Page 2 of this APA guide states:

Report exact p values to two or three decimals (e.g., p = .006, p =
.03)

as well as:

However, report p values less than .001 as “p < .001.”

I would follow their advice, as it is typically what I see in manuscripts in my domain.
